Heart: Exam 1
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- 1.Normal heart sounds are caused by which of the following events?
- A.
Closure of the heart valves
- B.
Opening and closing of the heart valves
- C.
Friction of blood against the chamber walls
- D.
Excitation of the SA node
- 2.The source of blood carried to capillaries in the myocardium would be the __________________________.
- A.
Coronary veins
- B.
Coronary sinus
- C.
Fossa ovalis
- D.
Coronary arteries
- 3.Hemorrhage with a large loss of blood causes _________________________.
- A.
A rise in blood pressure due to change in cardiac output
- B.
A lowering of 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
- 4.The left ventricular wall of the heart is thicker than the right wall in order to ___________________________.
- A.
Expand the thoracic cage during diastole
- B.
Pump blood with great pressure
- C.
Pump blood through a smaller valve
- D.
Accommodate a great volume of blood
- 5.Select the correct statement about cardiac output.
- A.
A slow heart rate increases end diastolic volume, stroke volume, and force of contraction
- B.
Stoke volume increases if end diastolic volume decreases.
- C.
If a semilunar value were partially obstructed, the end systolic volume in the affected ventricle would be decreased.
- D.
Decreased venous return will result in increased end diastolic volume
- 6.Which of these vessels receives blood during ventricular systole?
- A.
Both the aorta and pulmonary track
- B.
Pulmonary veins only
- C.
Aorta only
- D.
Pulmonary arteries only
- 7.Commotio cordis is heart failure due to a ___________________.
- A.
Severe electrical shock to the body
- B.
Mild electrical shock to the heart itself
- C.
Loss of blood from an artery
- D.
Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is re-polarizing
- 8.Foramen ovule _____________________________.
- A.
Connects the two atria in the fetal heart
- B.
Is a connection between the pulmonary trunk and the aorta in the fetus
- C.
Is a shallow depression in the inter ventricular septum
- D.
Is a condition in which the heart valves do not completely close
- 9.The time of day most hazardous for heart attacks is ________________.
- A.
Morning
- B.
Noontime
- C.
Evening
- D.
During sleep
- 10.Damage to the __________________ is referred to as heart block.
- A.
AV valves
- B.
SA node
- C.
AV node
- D.
AV bundle
- 11.During the period of ventricular filling ______________________________________.
- A.
The atria remain in diastole.
- B.
It is represented by the P wave on the ECG
- C.
Blood flows passively through the atria and the open AV valves into the ventricles
- D.
Pressure in the heart is at its peak
- 12.Which vessel of the heart receives blood during right ventricular systole?
- A.
Aorta
- B.
Venae cavae
- C.
Pulmonary veins
- D.
Pulmonary trunk
- 13.Which of the events below does not occur when the semilunar valves are open?
- A.
Ventricle are in systole
- B.
Blood enters pulmonary arteries and the aorta
- C.
Ventricles are in diastole
- D.
AV valves are closed
- 14.The tricuspid valve is closed _________________________.
- A.
By the movement of blood from atrium to ventricle
- B.
While the ventricle is in diastole
- C.
While the atrium is contracting
- D.
When the ventricle is in systole
- 15.
- A.
Gender
- B.
Body temperature
- C.
Age
- D.
Skin color
- 16.The P wave of a normal electrocardiogram indicates _____________________________.
- A.
Atrial depolarization
- B.
Atrial re-polarization
- C.
Ventricular depolarization
- D.
Ventricular re-polarization
- 17.If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells _______________________.
- A.
Tetanic contractions might occur, which would stop the heart's pumping action
- B.
It would be less than 1--2 ms
- C.
It would be much longer before cardiac cells could respond to a second stimulation
- D.
Contractions would last as long as the refractory period
- 18.The second heart sound is heard during which phase of the cardiac cycle?
- A.
Isovolumetric contraction
- B.
Ventricular ejection
- C.
Isovolumetric relaxation
- D.
Ventricular filling
- 19.Which of the following is not part of the conduction system of the heart?
- A.
AV node
- B.
AV valve
- C.
SA node
- D.
Bundle of His
- 20.The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it _________________________.
- A.
Expands the thoracic cage
- B.
Pumps blood against a greater resistance
- C.
Sends blood through a smaller valve
- D.
Pumps a greater volume of blood
- 21.If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________________________________________.
- A.
Heart rate would decrease, but blood pressure would rise due to the excess sodium present
- B.
Potassium channels compensate and no change in heart rate would occur
- C.
Threshold is reached more quickly and heart rate would increase
- D.
Tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
- 22.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
- 23.Select the correct statement about the heart valves.
- A.
Aortic and pulmonary valves control the flow of blood into the heart
- B.
The tricuspid valve divides the left atrium from the left ventricle
- C.
The mitral valve separates the right atrium from the right ventricle
- D.
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur
- 24.Small muscle masses attached to the chordae tendineae are the _______________________
- A.
Venae cavae
- B.
Trabecular carneae
- C.
Pectinate muscles
- D.
Papillary muscles
- 25.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
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