Heart

Question 1

The external boundary between the atria and ventricles is the

Answer 1

coronary sulcus

Question 2

EKG to their descriptions: indicates ventricular repolarization

Answer 2

T wave

Question 3

EKG to their descriptions: represents the time from the beginning of ventricular depolarization to the end of ventricular repolarization

Answer 3

Q-T interval

Question 4

EKG to their descriptions: represents atrial depolarization

Answer 4

P wave

Question 5

EKG to their descriptions: represents the time when the ventricular contractile fibers are fully depolarized; occurs during the plateau phase of the action potential

Answer 5

S-T segment

Question 6

EKG to their descriptions:represents the onset of ventricular depolarization

Answer 6

QRS complex

Question 7

EKG to their descriptions:represents the conduction time from the beginning of atrial excitation to the beginning of ventricular excitation

Answer 7

P-Q interval

Question 8

major branch from the ascending aorta; passes inferior to the left auricle

Answer 8

left coronary artery

Question 9

lies in the posterior interventricular sulcus; supplies the walls of the ventricles with oxygenated blood

Answer 9

posterior interventricular branch

Question 10

located in the coronary sulcus on the posterior surface of the heart; receives most of the deoxygenated blood from the myocardium

Answer 10

coronary sinus

Question 11

lies in the coronary sulcus; supplies oxygenated blood to the walls of the right ventricle

Answer 11

marginal branch

Question 12

lies in the coronary sulcus; drains the right atrium and right ventricle

Answer 12

small cardiac vein

Question 13

major branch from the ascending aorta; lies inferior to the right auricle

Answer 13

right coronary artery

Question 14

lies in the posterior interventricular sulcus; drains the right and left ventricles

Answer 14

middle cardiac vein

Question 15

lies in the anterior interventricular sulcus; supplies oxygenated blood to the walls of both ventricles

Answer 15

anterior interventricular branch (left anterior descending artery

Question 16

lies in the anterior interventricular sulcus; drains the walls of both ventricles and the left atrium

Answer 16

great cardiac vein

Question 17

lies in the coronary sulcus; supplies oxygenated blood to the walls of the left ventricle and left atrium

Answer 17

circumflex branch

Question 18

drain the right ventricle and open directly into the right atrium

Answer 18

anterior cardiac veins

Question 19

collects oxygenated blood from the pulmonary circulation

Answer 19

left atrium

Question 20

pumps deoxygenated blood to the lungs for oxygenation

Answer 20

right ventricle

Question 21

their contraction pulls on and tightens the chordae tendineae, preventing the valve cusps from everting

Answer 21

papillary muscles

Question 22

cardiac muscle tissue

Answer 22

myocardium

Question 23

increase blood-holding capacity of the atria

Answer 23

auricles

Question 24

tendonlike cords connected to the atrioventricular valve cusps which, along with the papillary muscles, prevent valve eversion

Answer 24

chordae tendineae

Question 25

the superficial dense irregular connective tissue covering of the heart

Answer 25

fibrous pericardium

Question 26

outer layer of the serous pericardium; is fused to the fibrous pericardium

Answer 26

parietal pericardium

Question 27

endothelial cells lining the interior of the heart; are continuous with the endothelium of the blood vessels

Answer 27

endocardium

Question 28

pumps oxygenated blood to all body cells, except the air sacs of the lungs

Answer 28

left ventricle

Question 29

prevents backflow of blood from the right ventricle into the right atrium

Answer 29

tricuspid valve

Question 30

collects deoxygenated blood from the systemic circulation

Answer 30

right atrium

Question 31

left atrioventricular valve

Answer 31

bicuspid valve

Question 32

the remnant of the foramen ovale, an opening in the interatrial septum of the fetal heart

Answer 32

fossa ovalis

Question 33

blood vessels that pierce the heart muscle and supply blood to the cardiac muscle fibers

Answer 33

coronary circulation

Question 34

grooves on the surface of the heart which delineate the external boundaries between the chambers

Answer 34

sulci

Question 35

prevent backflow of blood from the arteries into the ventricles

Answer 35

semilunar valves

Question 36

internal wall dividing the chambers of the heart

Answer 36

septum

Question 37

separate the upper and lower heart chambers, preventing backflow of blood from the ventricles back into the atria

Answer 37

atrioventriclular valves

Question 38

inner visceral layer of the pericardium; adheres tightly to the surface of the heart

Answer 38

epicardum

Question 39

amount of blood contained in the ventricles at the end of ventricular relaxation

Answer 39

end-diastolic volume

Question 40

period of time when cardiac muscle fibers are contracting and exerting force but not shortening

Answer 40

isovolumetric contraction

Question 41

amount of blood ejected per beat by each ventricle

Answer 41

stroke volume

Question 42

amount of blood remaining in the ventricles following ventricular contraction

Answer 42

end-systolic volume

Question 43

difference between a person's maximum cardiac output and cardiac output at rest

Answer 43

cardiac reserve

Question 44

period of time when semilunar valves are open and blood flows out of the ventricles

Answer 44

ventricular ejection

Question 45

period when all four valves are closed and ventricular blood volume does not change

Answer 45

isovolumetric relaxation

Question 46

This law of the heart equalizes the output of the right and left ventricles and keeps the same volume of blood flowing to both systemic and pulmonary circuits

Answer 46

STARLING LAW OF THE HEART

Question 47

this term refers to the pressure that must be overcome before semilunar valves can open

Answer 47

afterload