Module 9 ML-3

Question 1

Arteries

Answer 1

thick elastic connective tissue, smooth muscle, endothelium

Question 2

Arterioles

Answer 2

thick smooth muscle (for cross sectional area), endothelium

Question 3

Capillaries

Answer 3

endothelium

Question 4

Venules

Answer 4

thin connective tissue, endothelium

Question 5

Veins

Answer 5

thin connective tissue, thin smooth muscle, endothelium, wide and floppy

Question 6

In response to systole what happens to the waves of pressure

Answer 6

as they move throughout the vasculature they decreased in amplitude with distance from the ventricles

Question 7

The pressure drops because..

Answer 7

the blood vessels offer resistance to flow and as the blood moves forward the pressure amplitude drops

Question 8

What happens when the LV ejects blood into the aorta

Answer 8

in diastole and while it is filling the blood is leaving and the pressure is dropping

Question 9

Dicrotic notch

Answer 9

evidence that SL valve has closed

Question 10

Why doe the arterioles have the biggest drop of pressure

Answer 10

because they have the greatest resistance to flow

Question 11

Describe the resistance and radius of an artery

Answer 11

large radius and low resistance

Question 12

Why does the pressure in the artery rise during systole

Answer 12

because the SV pumped out atretches the arterial walls and it raises the pressur

Question 13

Compliance

Answer 13

how easy it is to strech

Question 14

what is the stretch in systole

Answer 14

1/3 of SV stretches up, 1/3 down and 1/3 flows to arterioles

Question 15

What occurs in diastole

Answer 15

elastic snap which is the strength of the snap back of the walls

Question 16

What inluences the snap back of the walls

Answer 16

amount of elastin

Question 17

What does elastic recoil do

Answer 17

maintains pressure and continues to push out the blood keeping it moving forward during diastole

Question 18

What do arteries serve as

Answer 18

pressure reservoir

Question 19

During diastole what happens to the stored blood

Answer 19

the 2/3 stored in the walls is pushed into the lumen and sent to arterioles

Question 20

True or False: blood pressure comes in waves as it moves through the arteries

Answer 20

true

Question 21

What is pulse pressure

Answer 21

amplitude of wave of blood pressure

Question 22

What happens to compliace and elasticity as you age

Answer 22

they both decrease which makes SP higher, Dp lower and PP tends to be higher, mAP stays the same

Question 23

Systole of stiff arteries

Answer 23

less stroke volume stored in walles and more volume goes into the lumen
-increased SP (compliance decreased)

Question 24

Diastole of stiff arteries

Answer 24

lower volume in lumen because not stored
-decreased DP beacuse we have less volume so less pressure