Cardio 7 Flashcards Preview

PHSI 208 > Cardio 7 > Flashcards

Flashcards in Cardio 7 Deck (29):
1

distribution of blood to tissues is based on..

amount and size of arteries

2

total blood flow through all arterioles =

cardiac output

3

flow for each arteriole depends on...

resistance

4

main integrating center for reflex control and distribution of blood

medullary cardiovascular control centre (CVCC)

5

CVCC

ensures adequate blood flow to brain and heart by maintaining mean arterial pressure

6

baroreceptor reflex

primary reflex pathway for homeostatic control of mean arterial blood pressure

7

baroreceptors found on..

aorta and on carotid artery

8

peripheral chemoreceptors

located on aortic arch and carotid artery; sense alterations in blood/gas conc. and changes in blood pH

9

peripheral chemoreceptors activation..

changes ventilation within respiratory system

10

vasovagal syncope

fainting in response to sight of blood, phlebotomy; the combination of decreased CO and decreased peripheral resistance cause a large fall in mean arterial pressure

11

3 TYPES OF CAPILLARIES

CONTINUOUS, FENESTRATED, SINUSOIDAL (DISCONTINUOUS)

12

capillary exchange occurs via...

diffusion (trans or paracellular) or transcytosis

13

bulk flow

mass movement of fluid as the result of hydrostatic or osmotic pressure gradients.

14

absorption

if bulk flow is resulting in fluid moving into the capillaries

15

filtration

f bulk flow is resulting in the movement of fluid out of the capillaries

16

hydrostatic pressure

the pressure in the blood vessels drives fluid out of the capillaries through pores and leaky cell junctions (filtration)

17

colloid osmotic pressure or oncotic pressure (pi)

the pressure that draws fluid into the capillaries is the pressure created by plasma proteins in the blood

18

oncotic pressure

osmotic pressure created by proteins

19

net pressure

hydrostatic pressure - colloid osmotic pressure

20

positive net pressure

indicates filtration

21

negative net pressure

indicates absorption

22

lymphatic vessels

assists cardiovascular system with returning fluid and proteins lost through capillaries

23

lymphatic vessels are made of..

single endothelial cell layer

24

lymphatic vessels contain..

-large inter endothelial junctions that act as one way valves
-nodes that contain immune cells

25

expansion phase of lymphatics

the interstitial hydrostatic pressure is higher than inside the lymphatic causing the microvalves to open and fluid to flow in

26

compression phase

lymphatic hydrostatic pressure exceeds interstitial, the microvalves close and the secondary valves open.

27

edema

an abnormal accumulation of fluid in interstitial space

28

causes of edema

1. inadequate lymph drainage
2. disruption in normal balance between capillary filtration and absorption

29

disruption in normal balance between capillary filtration and absorption caused by..

1. increased capillary hydrostatic pressure (heart failure)
2. decrease in plasma protein conc. (malnutrition, liver failure)
3. increase in interstitial proteins (excessive leakage of proteins out of capillaries)