Ch 21 Lec 2 - Heart

Question 0

two atrioventricular valves

Answer 0

bicuspid, tricuspid

Question 1

we have two ventricles because humans have a blank

Answer 1

high metabolism

Question 2

tricuspid valve is aka right blank valve

Answer 2

av

Question 3

tricuspid valve on the blank

Answer 3

right

Question 4

tricuspid valve opens when blank force is greater and closes when blank force is greater

Answer 4

atrial, ventricular

Question 5

bicuspid valve is on the blank

Answer 5

left

Question 6

these hold valves in place and attach to cusps on ventricle side

Answer 6

chordae tendonae

Question 7

small bundles of muscles that attach to the chordae tendonae

Answer 7

papillary muscles

Question 8

when valves close, papillary muscles blank

Answer 8

contract and tighten cords

Question 9

scaffolding on interior walls of ventricles

Answer 9

trabeculae carneae

Question 10

valves between ventricle and artery

Answer 10

semilunar

Question 11

valve on the right at the entrance to the pulmonary trunk and opens when right blank contracts

Answer 11

pulmonary, ventricle

Question 12

valve on the left at entrance to aorta and opens when left blank contracts

Answer 12

aortic, ventricle

Question 13

right atrium receives blood from blank and blank plus the coronary sinus

Answer 13

superior and inferior vena cava

Question 14

path of blood

Answer 14

right atrium, right av valve, right ventricle, pulmonary valve, pulmonary trunk, to lungs, left atrium, left av valve, left ventricle, aortic valve, aorta, to tissues

Question 15

funnel leading from right ventricle to pulmonary trunk

Answer 15

conus arteriosus

Question 16

receives blood from pulmonary veins

Answer 16

left atrium

Question 17

supplies the heart tissues with blood and blockage can result in a heart tissue dying

Answer 17

coronary circulation

Question 18

these branch directly off of the aorta as it emerges

Answer 18

coronary arteries

Question 19

left coronary artery has these two branches

Answer 19

circumflex, anterior interventricular artery

Question 20

right coronary artery has these two branches

Answer 20

posterior interventricular artery, marginal artery

Question 21

these drain the myocardium

Answer 21

cardiac veins

Question 22

three cardiac veins

Answer 22

great, middle, small

Question 23

this empties into the right atrium

Answer 23

coronary sinus

Question 24

contractile phase of heart where chamber empties

Answer 24

systole

Question 25

relaxation phase of heart and chambers fill

Answer 25

diastole

Question 26

lub is when the blank valves close

Answer 26

av

Question 27

dup is when the blank valves close

Answer 27

semilunar

Question 28

heart beat is enabled by these two things

Answer 28

nodal cells, conducting fibers

Question 29

specialized muscle cells that conduct action potentials in the heart

Answer 29

nodal cells

Question 30

distributes stimulus to myocardium in heart

Answer 30

conducting fibers

Question 31

action potentials move down the heart causing it to contract blank

Answer 31

unevenly

Question 32

blank contract before blank

Answer 32

atria, ventricles

Question 33

conduction in the heart is a blank step process

Answer 33

5

Question 34

the pacemaker of the heart that spontaneously depolarizes

Answer 34

sinoatrial node

Question 35

sa node is located at the blank of the right atrium

Answer 35

back wall

Question 36

where four chambers meet

Answer 36

atrioventricular node

Question 37

signal is transmitted through av node by

Answer 37

interventricular pathways

Question 38

this transmits down interventricular septum

Answer 38

av bundle

Question 39

these branch off the av bundle and moves further down the septum

Answer 39

bundle branches

Question 40

these reflect up external wall of ventricle and extend into papillary muscles

Answer 40

purkinje fibers

Question 41

three parts of ekg

Answer 41

p wave, qrs, t wave

Question 42

depolarization of atria in ekg

Answer 42

p wave

Question 43

depolarization of ventricle in ekg

Answer 43

qrs

Question 44

repolarization of ventricle in ekg

Answer 44

t wave

Question 45

cardiac output is blank liters per minute

Answer 45

5

Question 46

spontaneous contractions of heart

Answer 46

autorhymicity

Question 47

these chemicals increase rate and force of heart contraction

Answer 47

norepinephrine, epinephrine

Question 48

two parts of neural control in medulla

Answer 48

cardioacceleratory centers, cardioinhibitory centers

Question 49

these centers in medulla release norepinephrine and increase heart rate

Answer 49

cardioacceleratory center

Question 50

center in medulla that releases ach and decreases heart rate

Answer 50

cardioinhibitory center