Haemodynamics 2

Question 1

which vessels have the greatest resistance to blood flow

Answer 1

arterioles

Question 2

what percentage do arterioles play into the total peripheral resistance

Answer 2

60%

Question 3

arterioles connecting arteries to capillaries have the largest pressure drop in vasculature, what is this from and to

Answer 3

from 90mmHg to 40mmHg

Question 4

arterioles have a rich supply of ____ nerve fibers

Answer 4

sympathetic

Question 5

why do arterioles have a large amount of smooth muscle

Answer 5

because the radius is dependent on contraction state of smooth muscle

Question 6

what does the regulation of the radius in turn allow

Answer 6

the regulation of resistance and the regulation of blood flow

Question 7

what is the functional significance of arterioles having sympathetic nerve fibers and a large amount of smooth muscle

Answer 7

to control blood flow to capillary beds and the regulation of mean arterial pressure

Question 8

what is the mean arterial pressure

Answer 8

The mean arterial pressure (MAP) is a term used in medicine to describe an average blood pressure in an individual. It is defined as the average arterial pressure during a single cardiac cycle.

Question 9

arterioles always exhibit ___

Answer 9

tone

Question 10

what is tone

Answer 10

the degree of constriction relative to maximally dilated state