Quiz 11 - Heart Flashcards Preview

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Flashcards in Quiz 11 - Heart Deck (29):
1

parts of cardiovascular system

pulmonary circulation
systemic circulation
blood vessels

2

pulmonary circulation

path of blood from right ventricle to lungs, back to heart

3

systemic circulation

path of blood from left ventricle to body, back to heart

4

blood vessels

arteries - carries blood away from heart
veins - carries blood to the heart
capillaries - networks between arteries and veins; exchange materials between blood and tissues

5

location and anatomy of heart

- left of the midline
- superior surface of diaphragm between the lungs
- rotated slightly to the left

6

base and apex

base: superior end where vessels are attached
apex: pointed inferior end

7

layers of the heart

(superficial to deep)
- fibrous pericardium
- serous pericardium (parietal pericardium and pericardial cavity)
- myocardium
- endocardium

8

cardiac muscle structure

myocardial
- striated, short, branched and interconnected
- intercalated discs
- functional syncytium

9

intercalated disks

anchor cardiac cells together and allow free passage of ions via gap junctions

10

functional synctium

behaves as a single unit ("one muscle"); action potentials originating in any cell are transmitted to all others

11

chambers of the heart

- 2 atria
- 2 ventricles

12

atria

receiving chambers; each has a protruding auricle

13

right atrium

receives blood from superior and inferior vena cave and coronary sinus

14

left atrium

receives blood entering form pulmonary veins

15

ventricles

ejecting chambers; papillary muscles mark ventricular walls

16

right ventricle

pumps blood into the pulmonary trunk

17

left ventricle

pumps blood into the aorta

18

valves of the heart

- 2 antrioventricular valves
- 2 semilunar valves

19

antrioventricular valves

between atria and ventricles; prevent back flow into the atria when ventricles contract
- tricuspid
- biscuspid/mitral

20

semilunar valves

between ventricle and artery; prevents back flow of blood into the ventricles
- aortic
- pulmonary

21

vessels of the heart

pulmonary artery (trunk)
aorta
superior/inferior vena cava
pulmonary veins
coronary arteries
coronary veins

22

other structures of the heart

chordae tendinae
papillary muscles
interventricular septum
auricle

23

chordae tendinae

anchor atrioventricular valves to papillary muscles; prevents eversion of AV valves

24

interventricular septum

muscle wall sparating ventricles

25

conducting tissues of the heart

heart muscle cells contract, without nerve impulses, in a regular, continuous way

26

types of nodes in heart

sinoatrial node
atrioventricular node
AV bundle

27

sinoatrial node

delays impulse ~0.1 seconds: allows atrial contraction while ventricles relax

28

AV bundle

(bundle of His) - passes impulse from atria to ventricles via bundle branches

29

parts of bundle of His

purkinje fibers - carry impulses from the heart apex to base, stimulating ventricular myocytes