Lecture 5 - Microcirculation

Question 1

Artereovenous shunts have non-nutritional blood flow (nutrients do not pass into the tissues), but they are important in heat regulation, so they are abundant in the _____.

Answer 1

Skin

Question 2

Capillary ______ are what control blood flow into capillary beds. They are not innervated (constriction or relaxation depends on local metabolites), and they are not ubiquitous in the circulatory system. They can be found in the mesentery, but not in the ____ or skeletal muscle.

Answer 2

Sphincters

Heart

Question 3

Contraction and dilation of terminal ______ controls the flow of blood in the microvasculature as a whole, so this really controls the mean capillary pressure (Pc).

Answer 3

Arterioles

Question 4

Continuous capillaries are the most abundant kind of capillaries. Where are they particularly important for forming a barrier?

Answer 4

BBB

Question 5

Sinusoidal capillaries have large fenestrations. Where are these typically found?

Answer 5

In the liver, bone marrow, and the Spleen.

Question 6

Oncotic pressure of the capillaries is exerted in an ______ (outward or inward?) direction, while hydrostatic pressure is exerted ______ (outward or inward?).

Keep in mind outward = POSITIVE value.

Answer 6

Inward

Outward

Question 7

The basement membrane of Lymphatic capillaries is ______ (complete or incomplete), which is different than blood capillaries.

Answer 7

Incomplete