Reference no: EM131126134

1. The heart's location is

a. primarily right of the midline in the thoracic cavity, with the apex resting on the diaphragm and the base forming the posterior surface.

b. primarily right of the midline in the thoracic cavity, with the base resting on the diaphragm and the apex forming the top of the heart.

c. primarily left of the midline in the thoracic cavity, with the base resting on the diaphragm and the apex forming the top of the heart.

d. primarily left of the midline in the thoracic cavity, with the apex resting on the diaphragm and the base forming the posterior surface.

2. Which layer of the heart and its associated location/function is mismatched?

a. epicardium: the visceral portion of the serous pericardium

b. myocardium: responsible for contraction of the heart

c. endocardium: lines the inside of the heart

d. serous pericardium: tough connective tissue that anchors the heart

3. In correct sequence, which heart chambers, heart valves, and blood vessels would a drop of blood encounter from the time it flows out of the right atrium until it reaches the aorta?

a. bicuspid valve, right ventricle, pulmonary valve, pulmonary veins, pulmonary arteries, left atrium, tricuspid valve, left ventricle, aortic valve

b. pulmonary valve, right ventricle, tricuspid valve, pulmonary arteries, pulmonary veins, left atrium, bicuspid valve, left ventricle, aortic valve

c. tricuspid valve, right ventricle, pulmonary valve, pulmonary arteries, pulmonary veins, left atrium, bicuspid valve, left ventricle, aortic valve

d. tricuspid valve, right ventricle, aortic valve, pulmonary veins, pulmonary valve, pulmonary arteries, left atrium, bicuspid valve, left ventricle

4. Which represents the events that occur during the P wave, QRS complex, and T wave in an ECG?

a. P = ventricular depolarization; QRS = ventricular repolarization; T = atrial depolarization

b. P = atrial depolarization; QRS = ventricular repolarization; T = ventricular depolarization

c. P = atrial repolarization: QRS = ventricular repolarization: T = ventricular depolarization

d. P = atrial depolarization; QRS = ventricular depolarization; T = ventricular repolarization

5. Which is not true concerning events occurring in the heart?

a. Ejection of blood from the heart occurs during atrial systole.

b. During ventricular systole, the AV valves close.

c. In the relaxation period, all four chambers of the heart are in diastole.

d. The AV valves are open and ventricular filling begins during the relaxation period.

6. The heart sounds are caused by

a. spreading of an action potential through the heart's conduction system.

b. opening of the AV valves during the cardiac cycle.

c. turbulence from the closure of the valves.

d. the cardiac muscle contracting.

7. Which of the following plays a role in regulating stroke volume?

a. the degree of stretch in the heart before it contracts

b. the forcefulness of contraction of individual ventricular muscle fibers

c. the pressure required to eject blood from the ventricles

d. all of these help regulate stroke volume

8. Which blood vessel delivers blood to the right atrium?

a. vena cava.

b. pulmonary artery.

c. pulmonary trunk.

d. pulmonary vein.

9. The valve between the left atrium and left ventricle is the

a. bicuspid valve.

b. tricuspid valve.

c. aortic semilunar valve.

d. pulmonary semilunar valve.

10. The cardiovascular center is located in the

a. hypothalamus.

b. thalamus.

c. pons.

d. medulla oblongata.