Chapter 16

Question 1

Aortic valve

Answer 1

Semilunar valve located between the left ventricle and aorta

Question 2

Atrioventricular valve

Answer 2

Cuspid valves located between the atria and ventricles; include the tricuspid and bicuspid (mitral) valves

Question 3

Atrial conducting fibers

Answer 3

The specialized conducting fibers that transmit the cardiac impulse (action potential) from the SA node in the right atrium to the left atrium

Question 4

Atrium

Answer 4

Upper chamber of the heart that receives blood from veins

Question 5

Automaticity

Answer 5

The ability of the cardiac cells to generate its own electrical signals independently of stimulation from the CNS

Question 6

AV node

Answer 6

A part of the cardiac conduction system that acts as a relay station for the electrical signal coming from the SA node in the right atrium into the ventricles; the AV node slows the signal

Question 7

Bicuspid valve

Answer 7

The atrioventricular valve between the left atrium and left ventricle; also called the mitral valve

Question 8

Cardiology

Answer 8

Study of the heart

Question 9

Chordae tendineae

Answer 9

Tough fibrous bands of connective tissue that attach the cusps of the AV valves to the walls of the ventricles of the heart

Question 10

Conduction system

Answer 10

Specialized tissue in the heart that generates and transmits the electrical signals ( cardiac impulses or action potential)

Question 11

Coronary arteries

Answer 11

Right and left coronary arteries deliver oxygenated blood to the heart muscle

Question 12

Electrocardiogram (ECG)

Answer 12

Graphic recording of the electric events that occur during the cardiac cycle

Question 13

Endocardium

Answer 13

Inner lining of the heart wall

Question 14

Epicardium

Answer 14

Outer layer of the heart; forms part of the pericardium

Question 15

Great vessels

Answer 15

The large blood vessels that bring blood to and away from the heart: aorta, superior and inferior venae cavae, pulmonary trunk, and pulmonary veins

Question 16

Heart

Answer 16

The hollow muscular pump that pumps blood to the lungs for oxygenation and then to the rest of the body for the distribution of oxygen, nutrients, and hormones; the heart also picks up and delivers waste to the organs of excretion

Question 17

His- Purkinje system

Answer 17

A path of specialized conducting cells within the ventricles of the heart; allows the electrical signals to spread throughout the ventricles rapidly, thereby initiating myocardial contraction (systole)

Question 18

Interatrial septum

Answer 18

The septum between the right and left atria of the heart

Question 19

Mitral valve

Answer 19

Bicuspid valve

Question 20

Myocardium

Answer 20

Heart muscle

Question 21

Pacemaker

Answer 21

Specialized conduction tissue located in the upper right atrium; its rate of depolarization determines heart rate

Question 22

Pericardium

Answer 22

Slinglike serous membrane that partially encloses the heart; supports the weight of the heart

Question 23

Precordium

Answer 23

Area of the anterior chest that overlies the heart

Question 24

Purkinje fibers

Answer 24

Fast- conducting fibers located in the ventricular walls; conduct the electrical impulses from the bundle of His to the ventricular myocardium

Question 25

Rhythmicity

Answer 25

Regularity in tempo, as in the rhythmic beating of the heart

Question 26

SA node

Answer 26

Pacemaker

Question 27

Semilunar valve

Answer 27

Valve shaped like a half moon located between the ventricles and their attached vessels: pulmonic valve and aortic valve

Question 28

Tricuspid valve

Answer 28

Atrioventricular valve found between the right atrium and right ventricle

Question 29

Ventricles

Answer 29

Cavity in an organ, such as the ventricles in the heart and brain