The Cardiovascular System: Autoregulation and Capillary Dynamics
a. What regualtes the flow of blood into true capillaries?_________________
b. If all sphincters are closed, blood is ______________ to the venules through _______________ capillaries
1. Pre-capillary sphincter
Use arrows to show whetherhigh or low lvels of the following would cause the feeder arterioles to dilate and the sphincters to relax:
Physical factors also act as regulatory stimuli. How would the following affect arterioles?
a. Decreased blood pressure___________________
b. Increased blood pressure___________________
a. More perfusion(flowing of blood) in arterioles
b. Less perfusion in arterioles
Name three structural characteristics of capillaries which allow for passage of material out of the capillaries.
c. Cytoplasmic Vesicles
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 __________________________.
a. O2(oxygen) and CO2(carbon dioxide)
c. Clefts and fenestrations
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. Blood pressure
b. Fluid is quickly picked up in the lymphatic capillaries
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:
b. Fenestrations and/or clefts
c. Fenestrations and/or clefts
d. Fenestrations and/or clefts