Chapter 16
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Heart
- 1.Which of the following is least true of the myocardium?
- A.
Contains actin and myosin
- B.
Is the heart muscle
- C.
Is found in the ventricles but not he atria
- D.
Pumps the blood
- 2.During ventricular contraction, the AV valves close in order to
- A.
Speed up the action potential as it moves through the conduction system
- B.
Prevent the backflow of blood from the ventricles to the atria
- C.
Enhance drainage of the coronary veins
- D.
Push blood into the venae cavae
- 3.Which of the following is least related to "lubb" (of the lubb-dupp duo)?
- A.
Called S1
- B.
Due to the closure of the AV valves
- C.
Occurs at the beginning of ventricular contraction
- D.
Caused by the firing of the SA node
- 4.S2 is
- A.
Due to the closure of the semilunar valves at the beginning of ventricular relaxation
- B.
Lubb
- C.
The heart sound caused the contraction of the ventricular myocardium
- D.
Caused by the firing of the SA node
- 5.The purpose of the right heart is to pump blood
- A.
To the systemic circulation
- B.
Into the aorta
- C.
To the lungs for oxygenation
- D.
To the venae cavae
- 6.What do the venae cavae, pulmonary artery, and the aorta have in common?
- A.
All carry oxygenated blood
- B.
All carry unoxygenated blood
- C.
All are colored red
- D.
All are called great vessels
- 7.In which structure does blood change from blue to red?
- A.
Venae cavae
- B.
Pulmonary artery
- C.
Aorta
- D.
Pulmonary capillary
- 8.Which of the following spaces does not contain the heart?
- A.
Thoracic cavity
- B.
Ventral cavity
- C.
Pleural cavity
- D.
Mediastinum
- 9.The semilunar valves
- A.
Are outflow valves
- B.
Are anchored by chordae tendineae
- C.
"see" only oxygenated blood
- D.
"see" only unoxygenated blood
- 10.A cell that spontaneously depolarizes from resting membrane potential to threshold potential is
- A.
Called a pacemaker cell
- B.
Referred to as being ectopic
- C.
A stem cell
- D.
Found only in heart valves
- 11.The heart
- A.
Lies primarily to the right of the sternum
- B.
Only beats in response to stimulation by autonomic nerves
- C.
Is located within the mediastinum
- D.
Lies vertically and parallel to the midsternal line
- 12.Stenosis of this valve causes left ventricular hypertrophy
- A.
Mitral
- B.
Tricuspid
- C.
Pulmonic
- D.
Aortic
- 13.Which of the following is true of coronary blood flow?
- A.
In a healthy heart, coronary blood flow can increase
- B.
Atherosclerotic coronary blood vessels are usually maximally dilated at rest
- C.
A decrease in coronary blood flow causes pain (called angina)
- D.
All of the above are true
- 14.Which of the following is not true about the left ventricle?
- A.
Pumps blood into the aorta
- B.
Receives blood from the left atrium
- C.
Contains oxygenated blood
- D.
The oxygen from blood within the left ventricle diffuses across the endocardium into the left ventricular myocardium
- 15.A collection of excess fluid in the pericardial space
- A.
Is called pericardial effusion
- B.
Compresses the heart externally
- C.
Impairs myocardial contraction
- D.
All of the above are true
- 16.What is located at the second rib and fifth intercostal space?
- A.
Base and apex of the heart
- B.
Semilunar valves
- C.
AV valves
- D.
SA node and AV nodes
- 17.An enlarged myocardium (ventricular hypertrophy) indicates
- A.
That the heart must work harder than normal
- B.
That there is inadequate coronary blood flow
- C.
A stenotic mitral valve
- D.
Chronic anemia
- 18.Both the pulmonic and aortic valves
- A.
Are attached to chordae tendineae
- B.
Are semilunar valves
- C.
"see" oxygenated blood
- D.
"see" unoxygenated blood
- 19.The action potential (cardia impulse) has two phases:
- A.
Systole and diastole
- B.
Filling and ejecting
- C.
Depolarization and repolarization
- D.
P wave and T wave
- 20.The semilunar valves open in response to
- A.
Rising ventricular pressure during ventricular contraction
- B.
Rising atrial pressure
- C.
Rising pressure in the pulmonary artery and aorta
- D.
Increasing oxygen saturation of the hemoglobin
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