Ch. 19 Flashcards
Arteries & Veins
True or False? Aggregate flow is conserved at each level of arborization.
True!
Where does the largest aggregate cross-sectional area occurs? Why?
Microcirculation; at each branch point, the combined cross-sectional area of daughter vessels exceeds the cross-sectional area of the parent vessel.
Most of the blood volume resides where?
Systemic Veins
Where is the site of greatest vascular resistance? Why?
Arterioles; resistance leads to pressure drops
Describe the relationship between aggregate cross-sectional area and linear velocity.
Inverse; velocity is high in the aorta, low in the capillaries; total area is low in the aorta, high in capillaries
What is the equation for capillary pressure?
How’d you do?
NOTE: Capillary pressure can never exceed the pressure of the arteriole before it
Describe the relation ship between pre- and post-capillary resistance during arteriolar dilation and venular constriction.
R_post > R_pre
Will track arteriole pressure
Describe the relation ship between pre- and post-capillary resistance during arteriolar constriction and venular dilation.
R_post «_space;R_pre
Will track venous pressure
Describe the relation ship between pre- and post-capillary resistance normally.
R_post < R_pre
0.2-0.4
What is the relationship between Young’s modulus and compliance?
Inverse
Rank the following from least to highest compliance: smooth muscle, elastin, rubber, collagen, wood
Wood < Collagen < Rubber < Elastin < Smooth Muscle
How would you determine the vessel compliance of a transmural pressure-volume diagram?
Slope of the tangent line
d_V/dP
