EXAM 2

Question 1

The AV valves

open to allow blood to flow from the atria into the ventricles
prevent blood from flowing back into the ventricles from the aorta and pulmonary artery.
all of the answers
include the aortic and pulmonary valves

Answer 1

open to allow blood flow from the atria into the ventricles

Question 1

The membrane that surrounds, protects and stations the heart is called the

pleura.
pericardium.
epicardium.
myocardium.

Answer 1

pericardium

Question 2

which layer of the heart wall consists of cardiac muscle tissue?

Pericardium
Epicardium
Myocardium
Endocardium

Answer 2

myocardium

Question 3

Which of the following blood vessels carries blood from the tissues back to the heart?

aorta
arterioles
veins
arteries

Answer 3

veins

Question 4

The “lub-dub” sounds heard during a heartbeat are caused by which of the following actions?

Blood entering the atria and ventricles
Contraction of the atria and ventricles
Blood flowing through the arteries and veins
Valves opening and closing

Answer 4

valves opening and closing

Question 5

The first (systolic) heart sound is caused by

closing of the semilunar valves
closing of the aortic valve only
closing of all four valves
closing of the AV valves

Answer 5

closing of the AV valves

Question 6

During which phase of the cardiac cycle do the ventricles contract?

Diastole
Systole
Resting phase
Refilling phase

Answer 6

systole

Question 7

The SA Node’s or “Pacemaker’s” main function is to:

initiate a signal that goes through the ventricular myocardium
initiates an impulse to travel through the atria
initiate purkinjie fibers to open/close semilunar valves.
cause ventricular contraction

Answer 7

initiates an impulse to travel through the atria

Question 8

during atrial systole?

.
The ventricles are contracting
the SL valves are open
The ventricles are relaxed
the atria are relaxed

Answer 8

the ventricles are relaxed

Question 9

The main function of the pericardium is to:

help with contraction of the 4 heart chambers
increase the internal temperature of the heart
reduce friction on the heart
serve as an exchange region for nutrients

Answer 9

reduce friction on the heart

Question 10

The P wave of the ECG represents

Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization

Answer 10

atrial depolarization

Question 11

Which valve prevents the backflow of blood from the right ventricle into the right atrium?

Mitral valve
Aortic valve
Tricuspid valve
Pulmonary valve

Answer 11

tricuspid valve

Question 12

average resting heart rate for a healthy adult?

40-60bpm
60-100bpm
100-120bpm
120-140bpm

Answer 12

60-100 bpm

Question 13

Which blood vessel carries oxygen-rich blood from the lungs to the heart?

Pulmonary artery
Pulmonary vein
Aorta
Superior vena cava

Answer 13

pulmonary vein