Cardio 6 Flashcards Preview

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Flashcards in Cardio 6 Deck (18):
1

sphygmomanometry

estimates blood pressure

2

normal blood pressure at rest

s: less than 120 and
d: less than 80

3

elevated blood pressure at rest

s: 120-129 and
d: less than 80

4

high blood pressure stage 1 at rest

s: 130-139 or
d: 80-89

5

high blood pressure stage 2 a rest

s: 140+ or
d: 90+

6

hypertensive crisis at rest

s: 180+ and/or
d: 120+

7

mean arterial pressure

inverse of (cardiac output x peripheral resistance)

8

factors that influence mean arterial blood pressure

blood volume, cardiac output, resistance, and distribution of blood between arterial and venous blood vessels

9

small changes in blood volume occurs from...

ingestion of food and liquids

10

changes in blood volume is resolved by...

kidneys

11

resistance =

1/radius^4

12

local control of arteriolar resistance

matches tissue blood flow to metabolic needs of the tissue
-take precedence over reflex control by CNS

13

sympathetic reflexes

mediated by the CNS maintain mean arterial pressure and govern blood distribution for certain homeostatic needs such as temperature regulation.

14

hormones

particularly those that regulate salt and water excretion by the kidneys, influence blood pressure by acting directly on the arterioles and by altering autonomic reflex control

15

total resistance depends on..

radius and arrangement (series of parallel) of each vessel

16

myogenic auto regulation

Some vascular smooth muscle has the ability to regulate its own state of contraction; an increase in blood pressure causes the vascular smooth muscle in the wall of the arteriole to stretch, which then causes the vascular smooth muscle to contract, leading to vasoconstriction

17

Local control of blood flow is important in allowing...

individual tissues to regulate their own blood supplies

18

The main determinant of resistance in the majority of arterioles is the

sympathetic nervous system; controls diameter with release of norepinephrine and secondary mechanism of epinephrine