Chapter 18: Heart

Question 1

The heart is a double pump, the right side has to do with the _____ circuit.

Answer 1

Pulmonary

Question 2

The heart is a double pump, the left side has to do with the _____ circuit.

Answer 2

Systemic

Question 3

How does heart rate affect stroke volume?
a. High heart rate decreases venous return, which increases end systolic volume (ESV) and stroke volume (SV).
b. Low heart rate reduces the end diastolic volume (EDV) and stroke volume (SV), because an inadequate supply of blood is pumped into the ventricles.
c. High heart rate reduces the end diastolic volume (EDV) and stroke volume (SV), because there is less time for ventricular filling.
d. High heart rate increases venous return, which increases end diastolic volume (EDV) and stroke volume (SV).

Answer 3

C

Question 4

What is the effect of high blood pressure on cardiac output?
a. High blood pressure increases preload and ventricular filling, thereby increasing cardiac output (CO).
b. High blood pressure increases afterload and reduces cardiac output (CO).
c. High blood pressure occurs only when the cardiac output is already very high.
d.High blood pressure reduces afterload, thereby increasing cardiac output (CO).

Answer 4

B

Question 5

How would a decrease in blood volume affect both stroke volume and cardiac output?
a. no change in stroke volume and decreased cardiac output
b. decreased stroke volume and decreased cardiac output
c. increased stroke volume and increased cardiac output
d. decreased stroke volume and no change in cardiac output

Answer 5

D

Question 6

Cardiac pacemaker cells have a steady resting membrane potential. True/False

Answer 6

?`

Question 7

The ____ side of the heart removes blood through the pulmonary circuit, while the ___ side of the heart moves through the systemic circuit.

Answer 7

Right, Left

Question 8

For the heart to contract, it is essential for the ANS nerves to innervate the heart. True/False

Answer 8

?

Question 9

The __________ are attached to the AV valve flaps.
a. chordae tendineae
b. papillary muscles
c. trabeculae carneae
d. pectinate muscles

Answer 9

A

Question 10

Blood exits the right atrium using the ___ valve.

Answer 10

Tricuspid

Question 11

The ___ ___ valve prevents backflow of blood into the left ventricle.

Answer 11

Aortic semilunar

Question 12

What is the purpose of the chordae tendineae?
a. Anchor the SL valves in the closed position
b. To open the AV valves
c. To open the SL valves
d. Anchor the AV valves in the closed position

Answer 12

D

Question 13

Blood exits the right ventricle using the ____ ____ valve.

Answer 13

Pulmonary semilunar

Question 14

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

Answer 14

Mitral/bicuspid

Question 15

___ ____ valve prevents backflow of blood into the right ventricle.

Answer 15

Pulmonary semilunar

Question 16

Left ventricle and aorta are separated by the ___ ___ valve.

Answer 16

Aortic semilunar

Question 17

Which of the following valves is most often faulty in the heart?
a. None of the choices is most often faulty in the heart.
b. The pulmonary semilunar valve
c. The tricuspid valve
d. The mitral, or bicuspid, valve

Answer 17

D

Question 18

Failure of which heart valve would allow blood to move from the left ventricle to the left atrium?
a. Mitral/bicuspid valve
b. Aortic semilunar valve
c. Tricuspid valve
d. Pulmonary semilunar valve

Answer 18

A

Question 19

A condition in which the valve flaps of the heart become stiff and constrict the opening is called _________.
a. pericardial friction rub
b. stenosis
c. angina pectoris
d. a shunt

Answer 19

B

Question 20

What makes the heart valves open and close?
a. Back-suction
b. Chordae tendineae
c. Blood pressure
d. Papillary muscles

Answer 20

C

Question 21

What muscles prevent the atrioventricular valves from everting during ventricular contraction?
a. Pectinate muscles
b. The myocardium
c. Papillary muscles
d. Interatrial muscles

Answer 21

C