Module 9 ML-3 Flashcards
Arteries
thick elastic connective tissue, smooth muscle, endothelium
Arterioles
thick smooth muscle (for cross sectional area), endothelium
Capillaries
endothelium
Venules
thin connective tissue, endothelium
Veins
thin connective tissue, thin smooth muscle, endothelium, wide and floppy
In response to systole what happens to the waves of pressure
as they move throughout the vasculature they decreased in amplitude with distance from the ventricles
The pressure drops because..
the blood vessels offer resistance to flow and as the blood moves forward the pressure amplitude drops
What happens when the LV ejects blood into the aorta
in diastole and while it is filling the blood is leaving and the pressure is dropping
Dicrotic notch
evidence that SL valve has closed
Why doe the arterioles have the biggest drop of pressure
because they have the greatest resistance to flow
Describe the resistance and radius of an artery
large radius and low resistance
Why does the pressure in the artery rise during systole
because the SV pumped out atretches the arterial walls and it raises the pressur
Compliance
how easy it is to strech
what is the stretch in systole
1/3 of SV stretches up, 1/3 down and 1/3 flows to arterioles
What occurs in diastole
elastic snap which is the strength of the snap back of the walls
What inluences the snap back of the walls
amount of elastin
What does elastic recoil do
maintains pressure and continues to push out the blood keeping it moving forward during diastole
What do arteries serve as
pressure reservoir
During diastole what happens to the stored blood
the 2/3 stored in the walls is pushed into the lumen and sent to arterioles
True or False: blood pressure comes in waves as it moves through the arteries
true
What is pulse pressure
amplitude of wave of blood pressure
What happens to compliace and elasticity as you age
they both decrease which makes SP higher, Dp lower and PP tends to be higher, mAP stays the same
Systole of stiff arteries
less stroke volume stored in walles and more volume goes into the lumen
-increased SP (compliance decreased)
Diastole of stiff arteries
lower volume in lumen because not stored
-decreased DP beacuse we have less volume so less pressure
