NCCT Ndc
Glands, heart, vessels
- 1.
Normal heart sounds are caused by which of the following events?
- A.
Excitation of the SA node
- B.
Closure of the heart valves
- C.
Friction of blood against the chamber walls
- D.
Opening and closing of the heart valves
Correct Answer
B. Closure of the heart valves -
- 2.
Which of the events below does not occur when the semilunar valves are open?
- A.
Ventricles are in diastole
- B.
Blood enters pulmonary artieries and the aorta
- C.
Av valves are closed
- D.
Ventricles are in systole
Correct Answer
A. Ventricles are in diastole -
- 3.
Hemrrhage with a large loss of blood causes
- A.
A lowering of blood pressure due to change in cardiac output
- B.
A rise in blood pressure due to change in cardiac output
- C.
No change in blood pressure but a slower heart rate
- D.
No change in blood pressure but a change in respiration
Correct Answer
A. A lowering of blood pressure due to change in cardiac output -
- 4.
The left ventricular wall of the heart is thicker than the right wall in order to
- A.
Acoommodate a greater volume of blood
- B.
Expand the thracic cage during diastole
- C.
Pump blood with greater pressure
- D.
Pump blood through a smaller valve
Correct Answer
C. Pump blood with greater pressure -
- 5.
Damage to the__________ is referred to as heart block
- A.
SA node
- B.
AV valves
- C.
AV bundles
- D.
AV node
Correct Answer
D. AV node -
- 6.
The p wave of a normal electrocardiogram indicates_____________
- A.
Ventricular repolarization
- B.
Ventricular depolarization
- C.
Atrial repolarization
- D.
Atrial depolarization
Correct Answer
D. Atrial depolarization -
- 7.
Blood within the pulmonary veins returns to the
- A.
Right atrium
- B.
Left atrium
- C.
Right ventricle
- D.
Left ventricle
Correct Answer
B. Left atrium -
- 8.
Small muscle masses attached to the chordae tendineae are the
- A.
Trabeculae carneae
- B.
Pectinate muscles
- C.
Papillary muscles
- D.
Venae cavae
Correct Answer
C. Papillary muscles -
- 9.
The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is
- A.
Ischemia
- B.
Pericarditis
- C.
Myocardial infarct
- D.
Angina pectoris
Correct Answer
D. Angina pectoris -
- 10.
To auscultate the aortic semilunar valve, you would place your stethoscope in the
- A.
Second intercostal space to the right of the sternum
- B.
Second intercostal space to the left of the sternum
- C.
Fifth intercostal space inferior to the left nipple
- D.
Fifth right intercostal space
Correct Answer
A. Second intercostal space to the right of the sternum -
- 11.
The source of blood carried to capillaries in the myocardium would be the
- A.
Coronary sinus
- B.
Fossa ovalis
- C.
Coronary arteries
- D.
Coronary veins
Correct Answer
C. Coronary arteries -
- 12.
The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it
- A.
Pumps a greater volume of blood
- B.
Pumps blood against a greater resistance
- C.
Expands the thoracic cage
- D.
Sends blood through a smaller valve
Correct Answer
B. Pumps blood against a greater resistance -
- 13.
Which of the following factors does not influence heart rate
- A.
Skin color
- B.
Age
- C.
Gender
- D.
Body temperature
Correct Answer
A. Skin color -
- 14.
Which of the following is not an age-related change affecting the heart?
- A.
Atherosclerosis
- B.
Decline in cardiac reserve
- C.
Fibrosis of cardiac muscle
- D.
Thinning of the valve flaps
Correct Answer
D. Thinning of the valve flaps -
- 15.
If cardiac muscle is deprived of its normal blood supply, damage would primarily result from
- A.
Decreased delivery of oxygen
- B.
A decrease in the number of available mitochondria for energy production
- C.
A lack of nutrients to feed into metabolic pathways
- D.
An inadequate supply of lactic acid
Correct Answer
A. Decreased delivery of oxygen -
- 16.
If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells
- A.
It would be much longer before cardiac cells could respond to a second stimulation
- B.
Contractions would last as long as the refractory period
- C.
Tetanic contractions might occur, which would stop the hearts pumping action
- D.
It would be less than 1 2 ms
Correct Answer
C. Tetanic contractions might occur, which would stop the hearts pumping action -
- 17.
Norepinephrine acts on the heart by
- A.
Decreasing heart contractility
- B.
Causing a decrease in stroke volume
- C.
Blocking the action of calcium
- D.
Causing threshold to be reached more quickly
Correct Answer
D. Causing threshold to be reached more quickly -
- 18.
If the vagal nerves to the heart were cut, the result would be that
- A.
The heart would stop, since the vagal nerves trigger the heart to contract
- B.
The heart rate would increase by about 25 beats per minute
- C.
The av node would become the pacemaker of the heart
- D.
Parasympathetic stimulation would increase, causing a decrease in heart rate
Correct Answer
B. The heart rate would increase by about 25 beats per minute -
- 19.
Foramen ovale
- A.
Connects the two atria in the fetal heart
- B.
Is a condition in which the heart valves do not completley close
- C.
Is a shallow depression in the intreventricular septum
- D.
Is a connection between the pulmonary trunk and the aorta in the fetus
Correct Answer
A. Connects the two atria in the fetal heart -
- 20.
Which vessel of the heart recieves blood during right ventricular systole?
- A.
Venae cavae
- B.
Pulmonary trunk
- C.
Aorta
- D.
Pulmonary veins
Correct Answer
B. Pulmonary trunk -
- 21.
Which of these vessels receives blood during ventricular systole?
- A.
Aorta only
- B.
Pulmonary arteries only
- C.
Pulmonary veins only
- D.
Both aorta and pulmonary trunk
Correct Answer
D. Both aorta and pulmonary trunk -
- 22.
Which of the following is not part of the conduction system of the heart?
- A.
AV node
- B.
Bundle of His
- C.
AV valve
- D.
SA node
Correct Answer
C. AV valve -
- 23.
The tricuspid valve is closed
- A.
While the ventricle is in diastole
- B.
When the ventricle is in systole
- C.
While the atrium is contracting
- D.
By the movement of blood from the atrium to ventricle
Correct Answer
B. When the ventricle is in systole -
- 24.
When viewing a dissected heart, it is easy to visually discern the right and left ventricles by
- A.
Tracing out where the auricles connect
- B.
Noticing the thickness of the venricle walls
- C.
Locating the apex
- D.
Finding the papillary muscles
Correct Answer
B. Noticing the thickness of the venricle walls -
- 25.
Select the correct statement about the heart valves
- A.
The mitral valve seperates the right atrium from the right ventricle
- B.
The tricuspid valve divides the left atrium from the left ventricle
- C.
Aortic and pulmonary valves control the flow of blood into the heart
- D.
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricle contaction does not occur
Correct Answer
D. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricle contaction does not occur -
- 26.
Select the correct statement about the function of myocardial cells
- A.
The entire heart contracts as a unit or it does not contract at all
- B.
Each cardiac muscle cell is nnervated by a sympathetic nerve ending so that the nervous system can increase heart rate
- C.
The refactory period in skeletal muscle is much longer than that in cardiac muscle
- D.
The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
Correct Answer
A. The entire heart contracts as a unit or it does not contract at all -
- 27.
Select the correct statement about the structure of the heart wall
- A.
The fibrous skeleton forms the bulk of the heart
- B.
Connective tissue in the heart wall aids in the conduction of the action potential
- C.
The heart chambers are lined by the endomysium
- D.
They myocardium is the layer of the heart that actually contracts
Correct Answer
D. They myocardium is the layer of the heart that actually contracts -
- 28.
Compared to skeletal muscle, cardiac muscle
- A.
Has gap junctions that allow it to act as a functional syncytium
- B.
Lacks striations
- C.
Has more nuclei per cell
- D.
Cells are larger than skeletal muscle cells
Correct Answer
A. Has gap junctions that allow it to act as a functional syncytium -
- 29.
During the period of ventricular filling
- A.
Pressure in the heart is at its peak
- B.
Blood flows passively through the atria and the open AV valves into the ventricles
- C.
The atria remain in diastole
- D.
It is represented by the P wave on the ECG
Correct Answer
B. Blood flows passively through the atria and the open AV valves into the ventricles -
- 30.
The second heart sound is heard during which phase of the cardiac cylce?
- A.
Isovolumetric relaxation
- B.
Isovolumetric contraction
- C.
Ventricular ejection
- D.
Ventricular filling
Correct Answer
A. Isovolumetric relaxation -
- 31.
The time of day most hazardous for heart attacks is
- A.
Morning
- B.
Noon time
- C.
Evening
- D.
During sleep
Correct Answer
A. Morning -
- 32.
If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid
- A.
Threshold is reached more quickly and heart rate would increase
- B.
Potassium channels compensate and no change in heart rate would occur
- C.
Heart rate would decrease, but blood pressure would rise due to the excess sodium present
- D.
Tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
Correct Answer
A. Threshold is reached more quickly and heart rate would increase -
- 33.
Select the correct statement about cardiac output
- A.
A slow heart rate increases end diastolic volume, stroke volume, and force of contraction
- B.
Decreased venous return will result in increased end diastolic volume
- C.
If a semilunar valve were partially obstructed, the end systolic volume in the affected ventricle would be decreased
- D.
Stroke volume increasees if end diastolic volume decreases
Correct Answer
A. A slow heart rate increases end diastolic volume, stroke volume, and force of contraction -
- 34.
During contraction of hear muscle cells
- A.
The action potential is initiated by voltage-gated slow calcium channels
- B.
Some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
- C.
The action potential is prevented from spreading from cell to cell by gap junctions
- D.
Calcium is prevented from entering cardiac fibers that have been stimulated
Correct Answer
B. Some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores -
- 35.
Isovolumetric contraction
- A.
Refers to the short period during ventricular systole when the ventricles are completely
- B.
Occurs while the AV valves are open
- C.
Occurs immediately after the aortic and pulmonary valves close
- D.
Occurs only in people with heart valve defects
Correct Answer
A. Refers to the short period during ventricular systole when the ventricles are completely -
- 36.
Commotio cordis is heart failure due to a
- A.
Mild electrical shock to the heart itself
- B.
Severe electrical shock to the body
- C.
Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is repolarizing
- D.
Loss of blood from an artery
Correct Answer
C. Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is repolarizing -
- 37.
Which of the following is not one of the three main factors influencing blood pressure?
- A.
Cardiac output
- B.
Peripheral resistance
- C.
Emotional state
- D.
Blood volume
Correct Answer
C. Emotional state -
- 38.
Which of hte following chemicals does not help regulate blood pressure?
- A.
ADH
- B.
Atrial natriuretic peptide
- C.
Angiotensin II
- D.
Nitric acid
Correct Answer
D. Nitric acid -
- 39.
Which statement best describes arteries
- A.
All carry oxygenated blood to the heart
- B.
All carry blood away from the heart
- C.
All contain valves to prevent the backflow of blood
- D.
Only large arteries are lined with endothelium
Correct Answer
B. All carry blood away from the heart -
- 40.
Which tunic of an artery contains endothelium?
- A.
Tunica intima
- B.
Tunica media
- C.
Tunica externa
- D.
Basement membrane
Correct Answer
A. Tunica intima -
- 41.
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of
- A.
Arterioles
- B.
Arteries
- C.
Veins
- D.
Capillaries
Correct Answer
D. Capillaries -
- 42.
The circulatory route that runs from the digestive tract to the liver is called
- A.
Hepatic portal circulation
- B.
Pulmonary circulation
- C.
Coronary circulation
- D.
Cerebral circulation
Correct Answer
A. Hepatic portal circulation -
- 43.
The arteries that are also called distributing arteries are the
- A.
Elastic arteries
- B.
Muscular arteries
- C.
Arterioles
- D.
Capillaries
Correct Answer
B. Muscular arteries -
- 44.
Aldosterone will
- A.
Promote an increase in blood pressure
- B.
Promote a decrease in blood volume
- C.
Result in a larger ouput of urine
- D.
Decrease sodium reabsorption
Correct Answer
A. Promote an increase in blood pressure -
- 45.
The pulse pressure is
- A.
Systolic pressure plus diastolic pressure
- B.
Systolic pressure minus diastolic pressure
- C.
Systolic pressure divided by diastolic pressure
- D.
Diastolic pressure plus 1/3 (systolic pressure plus diastolic pressure)
Correct Answer
B. Systolic pressure minus diastolic pressure -
- 46.
Which of the following signs of hypovolemic shock is a relatively late sign?
- A.
Cold, clammy skin
- B.
Increased heart rate
- C.
Rapid, thready pulse
- D.
Rapildy falling blood pressure
Correct Answer
D. Rapildy falling blood pressure -
- 47.
Which of the following is likely during vigorous exercise?
- A.
Blood will be deverted to the digestive organs
- B.
The skin will be cold and clammy
- C.
Capillaries of the active muscles will be engorged with blood
- D.
Blood flow to the kidneys increases
Correct Answer
C. Capillaries of the active muscles will be engorged with blood -
- 48.
Which of the choices below explains why the artreioles are known as resistance vessels?
- A.
Their prime function is the exchange of nutrients and wastes between the blood and tissue cells
- B.
The contraction and realxation of the smooth muscle in their walls can change their diameter
- C.
They distribute blood to various parts of the body
- D.
They contain a large quantity of elastic tissue
Correct Answer
B. The contraction and realxation of the smooth muscle in their walls can change their diameter -
- 49.
Which of the following is true about veins?
- A.
Venous valves are formed from the tunica media
- B.
Up to 35% of total body blood is in venous circulation at any given time
- C.
Veins have a small lumen in relation to the thickness of the vessel wall
- D.
Veins are called capacitance vessels or blood reservoirs
Correct Answer
D. Veins are called capacitance vessels or blood reservoirs -
- 50.
Which of the following processes provides a long-term response to changes in blood pressure?
- A.
Neural controls
- B.
Baroreceptor-initiated reflexes
- C.
Chemoreceptor-initiated reflexes
- D.
Renal regulation
Correct Answer
D. Renal regulation -
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Feb 15, 2013Quiz Edited by
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