The Cardiovascular System: Autoregulation and Capillary Dynamics Flashcards

a. What regualtes the flow of blood into true capillaries?_________________
b. If all sphincters are closed, blood is ______________ to the venules through _______________ capillaries

Use arrows to show whetherhigh or low lvels of the following would cause the feeder arterioles to dilate and the sphincters to relax:
a. O2_____
b. CO2____
c. pH_____
d. nutrients______

Physical factors also act as regulatory stimuli. How would the following affect arterioles?
a. Decreased blood pressure___________________
b. Increased blood pressure___________________

Name three structural characteristics of capillaries which allow for passage of material out of the capillaries.
a.______________________
b.______________________
c.______________________

a. Diffusion accounts for the passage of________________________.
b. Non-lipid soluable molecules move by _____________________.
c. Water-soluable solutes, such as amino acids and sugars, move through __________________________.

Bulk fluid flows cause__________ at the arterial end and _______________ at the venous end of the capillary.

a. In a capillary, what is equivilant to hydrostatic pressure?
b. Why is hydrostatic pressure low in the interstitial fluid?
c. Net hydrostatic pressure tends to move fluid _______ the capillary.

a. Osmotic (or Colloid Osmotic) pressure in the capillaries is ________ compared to the interstitium.
b. Net osmotic pressure tends to move fluid _____ th ecapillaries.

Given a net hydrostatic pressure of 34 mmHg and a net osmotic pressure of 22 mmHg, the force favoring filtration would equal _____ mmHg.

Indicate which of the following which move through the capillary walls by diffusion and which move through fenestrations and/or clefts:
a. Butter:
b. Fish:
c. Cola:
d. Potatoes