CH 34 Hemodynamics

Question 1

components of circulatory system

Answer 1

1. arteries
2. arterioles
3. capillaries
4. venules
5. veins

Question 2

distribution of blood

Answer 2

9% pulmonary circulation
7% heart
84% systemic circulation

Question 3

what makes blood flow?

Answer 3

force that drives flow is greater than resistance

Question 4

how does blood get back to heart?

Answer 4

by resistance

Question 5

cardiac output

Answer 5

HR X SV

Question 6

Heart rate controlled by

Answer 6

autonomic nervous system

Question 7

SV

Answer 7

controlled by

1. myocardial contractility
2. cardiac afterload
3. cardiac preload

Question 8

preload

Answer 8

end diastolic volume/pressure

Question 9

afterload

Answer 9

arterial pressure that LV must overcome to eject blood

Question 10

CONTROL OF STROKE VOLUME IS BY

Answer 10

VENOUS RETURN

venous return is primary determinant of SV and therefore CO

Question 11

factors that determine venous return

Answer 11

Systemic filling pressure
Auxiliary muscle pumps
Resistance to flow between peripheral vessels and the right atrium
Right atrial pressure

Question 12

arterial pressure

Answer 12

peripheral resistance x CO

Question 13

arterial pressure regulated by

Answer 13

1. ans
2. renin-angiotensin system
3. kidneys

Question 14

steady state control by ANS

Answer 14

regulates AP by adjusting CO and peripheral resistance

Question 15

rapid control by ANS- baroreceptor reflex

Answer 15

Constriction of nearly all arterioles
Constriction of veins
Acceleration of heart rate

Question 16

renin-angiotensin-aldosterone system

Answer 16

Constriction of arterioles and veins (angiotensin II)

Retention of water by the kidney (aldosterone) through the retention of sodium

Question 17

natriuretic peptides

Answer 17

Protect the cardiovascular system in the event of volume overload
Reducing blood volume
Promoting dilation of arterioles and veins