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Flashcards in intro Deck (29):
1

the function of the CV system is to

maintain homeostasis

2

the heart acts as a

pump

3

the blood acts as

transportation mechanism

4

the vasculature acts as

tubing/exchange system

5

which acts in series?

pulmonary circulation

6

which acts in parallel?

systemic circulation

7

pulmonary circulation is

1. lower pressure
2. single pathway through a single set of capillary bed
3. in series

8

systemic circulation is

1. higher pressure
2. mostly parallel
3. oxygenated blood only visits one organ system before returning to the heart
4. blood flow to different organs can be regulated independently to match metabolic demand

9

at rest blood flow is:
brain:
skeletal muscle:
GI system:
Kidney:

14%

15%

21%

22%

10

during exercise blood flow to exercising muscles

80%

11

left side vs. right side of the heart

left side: higher pressure, systemic circulation

right side: lower pressure, serves pulmonary circulation

12

there is no direction connection between

right and left heart

13

why must the right and left sides of heart be closely matched?

because its a loop

14

how many chambers?

4 chambers
2 atria: smaller, priming chambers
2 ventricles: main pumping chambers

15

valves are

1. consist of 2 or 3 cusps
2. all 4 valves are in the same plane of the heart
3. valves are one way, control direction of blood flow through the heart
4. pressure operated--passive

16

cusps are

flaps of fibrous tissue and endothelium

17

atrioventricular valve

1. tricuspid and mitral (bicuspid)
2. between atria and ventricles
3. have chordae tendonae

18

chordae tendonae attach to

papillary muscles in ventricles and help stabilize valves and prevent prolapse of valves

19

semilunar valves

1. aortic and pulmonary
2. between ventricles and great arteries
3. no chordae tendonae

20

describe the layers of the heart from outside in

outermost:
1. pericardium
2. epicardium
3. myocardium
4. endocardium

21

the pericardium is made up of

outermost:
1. pericardial membrane
a. fibrous layer outer
b. parietal pericardium inner
2. pericardial fluid
3. visceral pericardium

22

Automaticity

1. heart beat is myogenic
2. originates within the heart itself

23

sinoatrial node

1. specialized myocytes
2. initiates the heartbeat

24

atrioventricular (AV) node is located

1. between atria and ventricles
2. slows con

25

AV node function

slows conduction to allow atrial contraction to precede ventricular contraction

26

the budle of his is between

AV node and left and right bundle branches in ventricles

27

purkinje fibers are located in

inner walls of the ventricles

28

purkinje fibers are

specialized cardiac myocytes cells that allow fast conduction

29

the his-purkinje system functions to

coordinated contraction of ventricles