Online Module 2 Quiz
Chapter 2 quiz for Online EKG Technician Program
Each of the questions or incomplete statements below is followed by suggested answers or completions. Select the one answer that is best in each case.
You must obtain a 80% to pass and you will not be able to review your answers
Questions and Answers
- 1.
The normal heart is the size of a
- A.
Foot.
- B.
Cherry.
- C.
Man’s fist.
- D.
Watermelon.
Correct Answer
C. Man’s fist.Explanation
The correct answer is "Man's fist." This is because the average size of a normal human heart is roughly the same size as a clenched fist of an adult male. The comparison helps to give a visual representation of the size of the heart, making it easier to understand and remember.Rate this question:
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- 2.
The top of the heart where the great vessels emerge is the
- A.
Apex.
- B.
Base.
- C.
Chordae tendonae.
- D.
Tricuspid valve.
Correct Answer
B. Base.Explanation
The correct answer is "Base." The base of the heart refers to the top of the heart where the great vessels emerge, such as the aorta and pulmonary artery. This is the opposite end of the heart from the apex, which is the bottom tip. The base is where the major blood vessels are connected and it is responsible for receiving blood from the veins and pumping it out to the rest of the body.Rate this question:
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- 3.
The fibrous tissue that divides the heart into right and left sides is the
- A.
Chordae tendonae
- B.
Papillary muscle.
- C.
Septum.
- D.
Pulmonic valve.
Correct Answer
C. Septum.Explanation
The fibrous tissue that divides the heart into right and left sides is called the septum. The septum acts as a wall, separating the two sides of the heart and preventing the mixing of oxygenated and deoxygenated blood. It ensures that oxygen-rich blood is pumped to the rest of the body while oxygen-poor blood is sent to the lungs for oxygenation. The chordae tendineae and papillary muscles are structures within the heart that are involved in the functioning of the valves, while the pulmonic valve is one of the valves that allows blood to flow from the heart to the lungs.Rate this question:
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- 4.
The apex of the heart is located at the
- A.
Top of the heart, where the great vessels emerge.
- B.
Right side of the heart.
- C.
Bottom of the heart, at the leftmost tip.
- D.
The back wall of the heart.
Correct Answer
C. Bottom of the heart, at the leftmost tip.Explanation
The apex of the heart is located at the bottom of the heart, at the leftmost tip. This is the pointed end of the heart, which is formed by the left ventricle. It is the part of the heart that is closest to the left side of the chest and is typically felt as a heartbeat.Rate this question:
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- 5.
Pericardial fluid
- A.
Decreases friction of the pericardial layers as they rub against each other.
- B.
Prevents backflow of blood from one chamber to the other.
- C.
Circulates through the heart’s chambers.
- D.
Lubricates the electrical system of the heart.
Correct Answer
A. Decreases friction of the pericardial layers as they rub against each other.Explanation
The correct answer is "Decreases friction of the pericardial layers as they rub against each other." Pericardial fluid acts as a lubricant between the layers of the pericardium, which is the membrane that surrounds the heart. This lubrication reduces friction and allows the heart to beat smoothly without any resistance or discomfort.Rate this question:
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- 6.
The innermost layer of the heart is the
- A.
Epicardium.
- B.
Pericardium.
- C.
Endocardium.
- D.
Myocardium.
Correct Answer
C. Endocardium.Explanation
The correct answer is Endocardium. The endocardium is the innermost layer of the heart, lining the chambers and valves. It is made up of a thin layer of endothelial cells and connective tissue. The endocardium helps to prevent blood clots and provides a smooth surface for blood flow within the heart.Rate this question:
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- 7.
The layer of the heart that is damaged during a heart attack is the
- A.
Epicardium.
- B.
Pericardium.
- C.
Endocardium.
- D.
Myocardium.
Correct Answer
D. Myocardium.Explanation
During a heart attack, the layer of the heart that is damaged is the myocardium. The myocardium is the middle layer of the heart wall and is responsible for the contraction and pumping of blood. When a heart attack occurs, the blood flow to a part of the myocardium is blocked, leading to the death of the heart muscle cells in that area. This can cause chest pain, shortness of breath, and other symptoms associated with a heart attack.Rate this question:
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- 8.
Which of these statements about the pericardium is NOT TRUE?
- A.
It anchors the heart to the diaphragm and great vessels
- B.
It is a two-layer sac enclosing the heart.
- C.
It serves as protection for the heart.
- D.
It is the wall of the heart that is damaged in a heart attack.
Correct Answer
D. It is the wall of the heart that is damaged in a heart attack.Explanation
The pericardium is a two-layer sac that encloses and protects the heart. It anchors the heart to the diaphragm and great vessels, providing stability and preventing excessive movement. However, it is not the wall of the heart that is damaged in a heart attack. A heart attack, also known as a myocardial infarction, occurs when there is a blockage in the coronary arteries, leading to the death of heart muscle tissue. The pericardium itself is not directly involved in a heart attack.Rate this question:
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- 9.
Which of the following statements about the right atrium is true?
- A.
It is a receiving chamber for oxygenated blood returning from the lungs.
- B.
It is the major pumping chamber of the heart.
- C.
It is about 100% saturated with oxygen.
- D.
It is the receiving chamber for deoxygenated blood coming from the vena cava.
Correct Answer
D. It is the receiving chamber for deoxygenated blood coming from the vena cava.Explanation
The right atrium is the receiving chamber for deoxygenated blood coming from the vena cava.Rate this question:
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- 10.
Which heart chamber delivers oxygenated blood to the entire body?
- A.
Right atrium
- B.
Right ventricle
- C.
Left atrium
- D.
Left ventricle
Correct Answer
D. Left ventricleExplanation
The left ventricle is the heart chamber that delivers oxygenated blood to the entire body. It receives oxygen-rich blood from the left atrium and pumps it out to the rest of the body through the aorta. The left ventricle is the largest and strongest chamber of the heart, responsible for supplying oxygen and nutrients to all the organs and tissues of the body.Rate this question:
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- 11.
The heart’s valves open and close in response to changes in
- A.
Oxygenation.
- B.
Sodium and potassium concentration.
- C.
Pressure.
- D.
The heart’s pacemaker.
Correct Answer
C. Pressure.Explanation
The correct answer is "Pressure." The heart's valves open and close in response to changes in pressure. When the pressure in the heart chambers is higher than the pressure in the blood vessels, the valves open to allow blood to flow out. When the pressure in the heart chambers is lower than the pressure in the blood vessels, the valves close to prevent backflow of blood. This mechanism ensures that blood flows in one direction through the heart.Rate this question:
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- 12.
Heart valves serve what purpose?
- A.
They prevent blood from flowing forward.
- B.
They prevent oxygenated blood from flowing through the coronary arteries.
- C.
They prevent backflow of blood.
- D.
They control the heart’s electrical signals.
Correct Answer
C. They prevent backflow of blood.Explanation
Heart valves serve the purpose of preventing backflow of blood. When the heart contracts, the valves open to allow blood to flow forward, and when the heart relaxes, the valves close to prevent blood from flowing back into the previous chamber. This ensures that blood flows in the correct direction through the heart and prevents any regurgitation or backflow of blood.Rate this question:
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- 13.
The valve that separates the right atrium and right ventricle is the
- A.
Mitral valve.
- B.
Pulmonic valve.
- C.
Aortic valve.
- D.
Tricuspid valve.
Correct Answer
D. Tricuspid valve.Explanation
The correct answer is the tricuspid valve. This valve is located between the right atrium and the right ventricle in the heart. It consists of three cusps or flaps that open and close to regulate the flow of blood from the atrium to the ventricle. When the atrium contracts, the tricuspid valve opens to allow blood to flow into the ventricle. When the ventricle contracts, the valve closes to prevent backflow of blood into the atrium.Rate this question:
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- 14.
The heart valve found at the opening of the pulmonary artery is the
- A.
Aortic valve.
- B.
Tricuspid valve.
- C.
Mitral valve.
- D.
Pulmonic valve.
Correct Answer
D. Pulmonic valve.Explanation
The correct answer is the pulmonic valve. The pulmonic valve is located at the opening of the pulmonary artery, which carries deoxygenated blood from the heart to the lungs. It prevents the backflow of blood into the right ventricle after it has been pumped out. The aortic valve is located at the opening of the aorta, the main artery that carries oxygenated blood from the heart to the rest of the body. The tricuspid valve is located between the right atrium and right ventricle, and the mitral valve is located between the left atrium and left ventricle.Rate this question:
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- 15.
Which of the following are both AV valves?
- A.
Tricuspid and mitral valves
- B.
Aortic and mitral valves
- C.
Mitral and pulmonic valves
- D.
Aortic and pulmonic valves
Correct Answer
A. Tricuspid and mitral valvesExplanation
The tricuspid and mitral valves are both AV valves because they are located between the atria and ventricles of the heart. The tricuspid valve is located between the right atrium and right ventricle, while the mitral valve is located between the left atrium and left ventricle. These valves allow blood to flow from the atria to the ventricles and prevent backflow of blood.Rate this question:
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- 16.
The first heart sound (S1) is associated with closure of which heart valves?
- A.
Mitral and aortic
- B.
Tricuspid and pulmonic
- C.
Tricuspid and mitral
- D.
Aortic and pulmonic
Correct Answer
C. Tricuspid and mitralExplanation
The first heart sound (S1) is associated with the closure of the tricuspid and mitral valves. These valves close at the beginning of ventricular systole, when the ventricles contract to pump blood out of the heart. The closure of these valves produces the "lub" sound that is heard during a normal heartbeat.Rate this question:
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- 17.
The second heart sound (S2) is associated with closure of which heart valves?
- A.
Mitral and aortic
- B.
Tricuspid and pulmonic
- C.
Tricuspid and mitral
- D.
Aortic and pulmonic
Correct Answer
D. Aortic and pulmonicExplanation
The second heart sound (S2) is associated with closure of the aortic and pulmonic valves.Rate this question:
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- 18.
The structure that prevents backflow of blood is the
- A.
Trebeculae carnae.
- B.
Superior vena cava.
- C.
Papillary muscle.
- D.
Valve.
Correct Answer
D. Valve.Explanation
The structure that prevents backflow of blood is the valve. Valves are found in various locations throughout the cardiovascular system, such as the heart and veins. They function by opening and closing to allow blood to flow in one direction while preventing it from flowing backwards. This helps to maintain proper blood circulation and prevent the backflow of blood.Rate this question:
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- 19.
What causes heart sounds?
- A.
Blood traveling through the heart
- B.
Opening of the heart valves
- C.
Closing of the heart valves
- D.
Blood hitting an obstruction in the peripheral circulation
Correct Answer
C. Closing of the heart valvesExplanation
Heart sounds are caused by the closing of the heart valves. When the heart valves close, they create vibrations that can be heard as the "lub-dub" sound of the heartbeat. The first sound, "lub," is caused by the closure of the atrioventricular valves (mitral and tricuspid valves) at the beginning of systole. The second sound, "dub," is caused by the closure of the semilunar valves (aortic and pulmonary valves) at the end of systole. These sounds are important for diagnosing heart conditions and assessing the proper functioning of the heart.Rate this question:
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- 20.
Through which structure must the blood travel in order to leave the right ventricle?
- A.
Right atrium
- B.
Tricuspid valve
- C.
Left ventricle
- D.
Pulmonic valve
Correct Answer
D. Pulmonic valve -
- 21.
The parasympathetic nervous system causes
- A.
Slowed digestion.
- B.
Decrease in heart rate.
- C.
Pupillary dilation.
- D.
Increase in blood pressure.
Correct Answer
B. Decrease in heart rate.Explanation
The parasympathetic nervous system is responsible for controlling the body's rest and digest functions. When activated, it slows down digestion, allowing the body to focus on other activities. It also causes a decrease in heart rate, promoting relaxation and conserving energy. Pupillary dilation and an increase in blood pressure are not typically associated with the parasympathetic nervous system, making them incorrect choices.Rate this question:
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- 22.
Which valves open to allow the ventricles to fill?
- A.
Aortic and pulmonic
- B.
Tricuspid and pulmonic
- C.
Tricuspid and mitral
- D.
Aortic and mitral
Correct Answer
C. Tricuspid and mitralExplanation
The tricuspid and mitral valves open to allow the ventricles to fill. These valves are located between the atria and ventricles of the heart. When the atria contract, the tricuspid and mitral valves open, allowing blood to flow from the atria into the ventricles. This filling phase is known as diastole. Once the ventricles are filled, the tricuspid and mitral valves close to prevent blood from flowing back into the atria during ventricular contraction.Rate this question:
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- 23.
The inferior vena cava returns deoxygenated blood to the heart from
- A.
The head and neck.
- B.
The coronary circulation.
- C.
The lower extremities and abdomen.
- D.
None of these—the vena cava carries oxygenated blood.
Correct Answer
C. The lower extremities and abdomen.Explanation
The inferior vena cava is a large vein that carries deoxygenated blood from the lower extremities and abdomen back to the heart. It does not carry oxygenated blood and is not responsible for returning blood from the head and neck or the coronary circulation.Rate this question:
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- 24.
Through which vessel does oxygenated blood enter the capillaries?
- A.
Aorta
- B.
Veins
- C.
Venules
- D.
Arterioles
Correct Answer
D. ArteriolesExplanation
Arterioles are small blood vessels that connect arteries to capillaries. They play a crucial role in regulating blood flow and directing oxygenated blood to the capillaries. Arterioles have smooth muscle walls that can constrict or dilate, controlling the amount of blood that enters the capillaries. This allows for efficient delivery of oxygenated blood to the tissues and organs. Therefore, arterioles are the vessels through which oxygenated blood enters the capillaries.Rate this question:
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- 25.
Which of the following is the correct sequence of blood flow through the peripheral circulation?
- A.
Arteries–veins–vena cava–capillaries
- B.
Arteries–arterioles–capillaries–venules– veins
- C.
Veins–venules–capillaries–arterioles– arteries
- D.
Capillaries–arterioles and venules–arteries and veins
Correct Answer
B. Arteries–arterioles–capillaries–venules– veinsExplanation
The correct answer is "Arteries–arterioles–capillaries–venules– veins." This sequence represents the correct flow of blood through the peripheral circulation. Arteries carry oxygenated blood away from the heart, arterioles are smaller branches of arteries, capillaries are tiny blood vessels where oxygen and nutrients are exchanged with tissues, venules collect blood from capillaries, and veins carry deoxygenated blood back to the heart.Rate this question:
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- 26.
Pulmonary veins deliver blood to the
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
B. Left atriumExplanation
The pulmonary veins carry oxygenated blood from the lungs back to the heart. Specifically, they deliver this oxygenated blood to the left atrium of the heart. From the left atrium, the blood will then pass into the left ventricle and be pumped out to the rest of the body. Therefore, the correct answer is the left atrium.Rate this question:
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- 27.
The vessel that delivers oxygenated blood to the capillary bed is the
- A.
Artery
- B.
Vein
- C.
Arteriole
- D.
Venule
Correct Answer
C. ArterioleExplanation
Arterioles are small blood vessels that branch out from arteries and deliver oxygenated blood to the capillary bed. They have muscular walls that can constrict or dilate to regulate blood flow and control blood pressure. Arterioles play a crucial role in the distribution of oxygen and nutrients to the body's tissues. Veins carry deoxygenated blood back to the heart, while arteries carry oxygenated blood away from the heart. Venules, on the other hand, are small blood vessels that collect deoxygenated blood from the capillary bed and merge to form veins.Rate this question:
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- 28.
The coronary circulation supplies oxygenated blood to the myocardium during
- A.
Ventricular ejection
- B.
Diastole
- C.
The entire cardiac cycle
- D.
Isovolumetric contraction
Correct Answer
B. DiastoleExplanation
During diastole, the coronary circulation supplies oxygenated blood to the myocardium. Diastole is the phase of the cardiac cycle when the heart is relaxed and filling with blood. During this phase, the coronary arteries receive blood flow from the aorta and deliver oxygenated blood to the myocardium, ensuring that the heart muscle has enough oxygen to function properly. This is important because the myocardium requires a constant supply of oxygen to sustain its contraction and maintain cardiac output.Rate this question:
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- 29.
The cardiac cycle’s two phases are
- A.
Systole and diastole
- B.
Isovolumetric relaxation and contraction
- C.
Preload and afterload
- D.
Atrial kick and ventricular filling
Correct Answer
A. Systole and diastoleExplanation
The cardiac cycle consists of two main phases: systole and diastole. Systole is the phase when the heart muscle contracts, pumping blood out of the chambers and into the arteries. Diastole is the phase when the heart muscle relaxes, allowing the chambers to fill with blood. These two phases work together to ensure proper blood circulation throughout the body.Rate this question:
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- 30.
The semilunar valves open when the
- A.
Atrial pressure exceeds the ventricular pressure
- B.
Atrial and ventricular pressures are equal
- C.
Ventricular pressure exceeds the aortic and pulmonary arterial pressures
- D.
Impulse arrives at the AV node
Correct Answer
C. Ventricular pressure exceeds the aortic and pulmonary arterial pressuresExplanation
The semilunar valves open when the ventricular pressure exceeds the aortic and pulmonary arterial pressures. This is because the semilunar valves are responsible for preventing backflow of blood from the arteries into the ventricles. When the ventricular pressure is higher than the arterial pressures, it indicates that the ventricles have pumped enough blood to overcome the resistance in the arteries, and the semilunar valves open to allow blood to be ejected into the arteries.Rate this question:
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- 31.
The pericardium is the layer of the heart that is damaged during a heart attack
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The pericardium is not the layer of the heart that is damaged during a heart attack. A heart attack occurs when there is a blockage in one or more of the coronary arteries, which supply oxygen-rich blood to the heart muscle. The damage during a heart attack typically occurs in the heart muscle itself, known as the myocardium. The pericardium is a protective sac that surrounds the heart, but it is not directly involved in the damage caused by a heart attack.Rate this question:
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- 32.
The heart chamber that has the greatest workload is the right atrium, as it pumps blood out to the entire body.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The explanation for the given answer is that the right atrium does not pump blood out to the entire body. The right atrium receives deoxygenated blood from the body and pumps it to the right ventricle, which then pumps it to the lungs for oxygenation. The left atrium, on the other hand, receives oxygenated blood from the lungs and pumps it to the left ventricle, which then pumps it out to the entire body. Therefore, the left atrium has the greatest workload as it pumps blood to the entire body.Rate this question:
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- 33.
The heart is composed primarily of muscle
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The heart is composed primarily of muscle, which allows it to contract and pump blood throughout the body. The cardiac muscle tissue in the heart is unique and different from the skeletal muscle found in other parts of the body. This specialized muscle tissue enables the heart to have a continuous rhythmic contraction, ensuring a steady flow of blood. Additionally, the heart muscle is highly resistant to fatigue, as it needs to work constantly without rest. Therefore, the statement "The heart is composed primarily of muscle" is true.Rate this question:
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- 34.
The heart has three layers: the endocardium, myocardium, and epicardium
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The heart is composed of three layers: the endocardium, myocardium, and epicardium. The endocardium is the innermost layer, lining the chambers of the heart and providing a smooth surface for blood flow. The myocardium is the middle layer, consisting of cardiac muscle tissue that contracts to pump blood throughout the body. The epicardium is the outermost layer, serving as a protective covering for the heart. Therefore, the statement that the heart has three layers is true.Rate this question:
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- 35.
Is [your statement here] true or false?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given answer is true because it directly states that the statement is true.Rate this question:
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- 36.
The pericardium is a double-walled sac that encloses the heart and serves as support and protection
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The pericardium is a double-walled sac that surrounds and protects the heart. It provides support and helps to prevent the heart from overexpanding. The outer layer of the pericardium is tough and fibrous, while the inner layer is smooth and serous. This arrangement allows the heart to move and contract within the pericardial sac without friction. Therefore, the statement "The pericardium is a double-walled sac that encloses the heart and serves as support and protection" is true.Rate this question:
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- 37.
The layer of the heart that does the work of contracting is the endocardium
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The endocardium is not the layer of the heart that does the work of contracting. The correct answer is false. The layer of the heart that does the work of contracting is the myocardium. The endocardium is the innermost layer of the heart that lines the chambers and valves.Rate this question:
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- 38.
The right atrium is a thin-walled receiving chamber for newly oxygenated blood from the lungs.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The right atrium is not a receiving chamber for newly oxygenated blood from the lungs. It is actually a receiving chamber for deoxygenated blood from the body. The newly oxygenated blood from the lungs enters the left atrium. Therefore, the statement is incorrect.Rate this question:
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- 39.
The left atrium pumps blood into the right atrium
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The left atrium does not pump blood into the right atrium. The left atrium receives oxygenated blood from the lungs and pumps it into the left ventricle, which then pumps the blood out to the rest of the body. The right atrium, on the other hand, receives deoxygenated blood from the body and pumps it into the right ventricle, which then pumps the blood to the lungs to be oxygenated. Therefore, the statement is false.Rate this question:
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- 40.
The heart’s top and bottom chambers are separated by valves that prevent backflow of blood
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the heart's top and bottom chambers, known as the atria and ventricles, are indeed separated by valves. These valves ensure that blood flows in only one direction, preventing any backflow. This is crucial for the efficient functioning of the heart, as it allows for the proper circulation of oxygenated and deoxygenated blood throughout the body.Rate this question:
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- 41.
The semilunar valves are the aortic and mitral valves
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. The semilunar valves are not the aortic and mitral valves. The aortic valve is a semilunar valve, but the mitral valve is not. The mitral valve is actually a atrioventricular valve. The semilunar valves are located between the ventricles and the major arteries leaving the heart, which are the aorta and the pulmonary artery.Rate this question:
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- 42.
The job of the heart valves is to prevent backflow of blood
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The heart valves play a crucial role in ensuring that blood flows in the correct direction through the heart. They open and close with each heartbeat, allowing blood to flow forward and preventing any backflow. This mechanism ensures that oxygenated blood is pumped to the body and deoxygenated blood is sent to the lungs for oxygenation. Therefore, the statement "The job of the heart valves is to prevent backflow of blood" is true.Rate this question:
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- 43.
The vena cava is a large artery that carries blood from the right ventricle to the lungs
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The vena cava is not an artery, but rather a large vein. It carries deoxygenated blood from the body back to the right atrium of the heart, not from the right ventricle to the lungs.Rate this question:
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- 44.
The three main coronary arteries are the aorta, the left main, and the chordae tendonae
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. The three main coronary arteries are the left coronary artery, the right coronary artery, and the circumflex artery. The aorta is not a coronary artery, but it is the main artery that carries oxygen-rich blood from the heart to the rest of the body. The chordae tendonae are not coronary arteries either, but they are fibrous cords that attach the heart valves to the muscles in the heart.Rate this question:
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- 45.
The first phase of diastole is called the atrial kick, and it is the phase during which the atria fill with blood from the ventricles
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The first phase of diastole is not called the atrial kick. The atrial kick refers to the contraction of the atria, which occurs during the late phase of diastole. During the first phase of diastole, known as isovolumetric relaxation, the ventricles relax and fill with blood from the atria. Therefore, the correct answer is false.Rate this question:
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- 46.
The phase of systole that results in the greatest consumption of myocardial oxygen is isovolumetric contraction
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During isovolumetric contraction, the ventricles contract without any change in volume, leading to an increase in pressure. This phase requires a significant amount of energy as the heart muscles are working against a closed system. The increased pressure during isovolumetric contraction results in a higher myocardial oxygen consumption compared to other phases of systole. Therefore, the given statement is true.Rate this question:
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