Ch 21 Lec 2 - Heart Flashcards Preview

Anatomy > Ch 21 Lec 2 - Heart > Flashcards

Flashcards in Ch 21 Lec 2 - Heart Deck (51):
0

we have two ventricles because humans have a blank

high metabolism

1

two atrioventricular valves

bicuspid, tricuspid

2

tricuspid valve is aka right blank valve

av

3

tricuspid valve on the blank

right

4

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

atrial, ventricular

5

bicuspid valve is on the blank

left

6

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

chordae tendonae

7

small bundles of muscles that attach to the chordae tendonae

papillary muscles

8

when valves close, papillary muscles blank

contract and tighten cords

9

scaffolding on interior walls of ventricles

trabeculae carneae

10

valves between ventricle and artery

semilunar

11

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

pulmonary, ventricle

12

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

aortic, ventricle

13

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

superior and inferior vena cava

14

path of blood

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

15

funnel leading from right ventricle to pulmonary trunk

conus arteriosus

16

receives blood from pulmonary veins

left atrium

17

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

coronary circulation

18

these branch directly off of the aorta as it emerges

coronary arteries

19

left coronary artery has these two branches

circumflex, anterior interventricular artery

20

right coronary artery has these two branches

posterior interventricular artery, marginal artery

21

these drain the myocardium

cardiac veins

22

three cardiac veins

great, middle, small

23

this empties into the right atrium

coronary sinus

24

contractile phase of heart where chamber empties

systole

25

relaxation phase of heart and chambers fill

diastole

26

lub is when the blank valves close

av

27

dup is when the blank valves close

semilunar

28

heart beat is enabled by these two things

nodal cells, conducting fibers

29

specialized muscle cells that conduct action potentials in the heart

nodal cells

30

distributes stimulus to myocardium in heart

conducting fibers

31

action potentials move down the heart causing it to contract blank

unevenly

32

blank contract before blank

atria, ventricles

33

conduction in the heart is a blank step process

5

34

the pacemaker of the heart that spontaneously depolarizes

sinoatrial node

35

sa node is located at the blank of the right atrium

back wall

36

where four chambers meet

atrioventricular node

37

signal is transmitted through av node by

interventricular pathways

38

this transmits down interventricular septum

av bundle

39

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

bundle branches

40

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

purkinje fibers

41

three parts of ekg

p wave, qrs, t wave

42

depolarization of atria in ekg

p wave

43

depolarization of ventricle in ekg

qrs

44

repolarization of ventricle in ekg

t wave

45

cardiac output is blank liters per minute

5

46

spontaneous contractions of heart

autorhymicity

47

these chemicals increase rate and force of heart contraction

norepinephrine, epinephrine

48

two parts of neural control in medulla

cardioacceleratory centers, cardioinhibitory centers

49

these centers in medulla release norepinephrine and increase heart rate

cardioacceleratory center

50

center in medulla that releases ach and decreases heart rate

cardioinhibitory center