Heart Chapter 20

Question 1

Identify A

Answer 1

Superior Vena Cava

Question 2

Identify B

Answer 2

Auricle Of Right Atrium

Question 3

Identify C

Answer 3

Right Ventricle

Question 4

Identify D

Answer 4

Left Ventricle

Question 5

Identify E

Answer 5

(E) Aortic Arch

Question 6

Identify F

Answer 6

Left Pulmonary Artery

Question 7

Identify G

Answer 7

Pulmonary Trunk

Question 8

Identify H

Answer 8

Auricle Of Left Atrium

Question 9

Identify A

Answer 9

Ascending Aorta

Question 10

Identify B

Answer 10

Opening Of Coronary Sinus

Question 11

Identify C

Answer 11

Right Atrium

Question 12

Identify D

Answer 12

Cusp Of Tricuspid Valve

Question 13

Identify F

Answer 13

Right Ventricle

Question 14

Identify G

Answer 14

Pulmonary Valve

Question 15

Identify H

Answer 15

Left Pulmonary Veins

Question 16

Identify I

Answer 16

Left Atrium

Question 17

Identify J

Answer 17

Aortic Value

Question 18

Identify K

Answer 18

Cusp Of Mitral Valve

Question 19

Identify L

Answer 19

Left Ventricle

Question 20

Identify M

Answer 20

Interventricular Septum

Question 21

The cardiac skeleton of the heart has which two of the following functions?
(a) It physically isolates the muscle fibers of the atria from those of the ventricles.
(b) It maintains the normal shape of the heart.
(c) It helps distribute the forces of cardiac contraction. (d) It allows more rapid contraction of the ventricles. (e) It strengthens and helps prevent overexpansion of the heart.

Answer 21

(a) It physically isolates the muscle fibers of the atria from those of the ventricles.
(b) It maintains the normal shape of the heart.

Question 22

Cardiac output is equal to the
(a) difference between the end-diastolic
volume and the end-systolic volume
(b) product of heart rate and stroke volume.
(c) difference between the stroke volume at rest
and the stroke volume during exercise
(d) stroke volume less the end-systolic volume
(e) product of heart rate and blood pressure

Answer 22

(b) product of heart rate and stroke volume.

Question 23

During diastole, a chamber of the heart
(a) relaxes and fills with blood
(b) contracts and pushes blood into an adjacent chamber,
(c) experiences a sharp increase in pressure
(d) reaches a pressure of approximately 120 mm Hg.

Answer 23

(a) relaxes and fills with blood

Question 24

During the cardiac cycle, the amount of blood ejected from the left
ventricle when the semilunar valve opens is the
(a) stroke volume (SV)
(b) end-diastolic volume (EDV)
(c) end-systolic volume (ESV),
(d) cardiac output (CO).

Answer 24

(a) stroke volume (SV

Question 25

What role do the chordae tendineae and papillary muscles play in the normal function of the AV valves?

Answer 25

When the ventricular contraction happens, tension in the papillary muscles pulls against the chordae tendineae, this keeps the cusps of the AV valve from swinging into the atrium. This doesn’t let the backflow of blood into the atrium as the ventricle contracts.

Question 26

Describe the three distinct layers that make up the heart wall.

Answer 26

Epicardium is the inside layer of the serous pericardium, this covers outer surface of the heart.
Myocardium is the muscle wall of the heart, it has cardiac muscle tissue, connective tissues, blood vessels, and nerves.
The endocardium is made up of a simple squamous epithelium (that help with diffusion) and an areolar layer that covers the inside of the heart.

Question 27

What are the valves in the heart, and what is the function of each?

Answer 27

Tricuspid valve (right atrioventricular valve) and mitral valve (left atrioventricular valve) doesnt let the backflow of blood of the ventricles into the atria.
Pulmonary valves and aortic semilunar valves doesnt let the backflow of blood of the pulmonary trunk and aorta into the right and left ventricles.

Question 28

Trace the normal pathway of an electrical impulse through the conducting system of the heart.

Answer 28

Atria (SA node), telling the signals to contact. / The atrioventricular (AV node), delaying the signal until the atria is empty of blood. / The right and left bundle branches carrying the signal to the Purkinje fibers. / The Purkinje fibers to your ventricles (bottom heart chambers), causing them to contract.