The Cardiovascular System: Autoregulation and Capillary Dynamics

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Flashcards for cardiovascular worksheets.
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1

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
2. Shunted
3. Thoroughfare

2

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______

a. Decrease
b. Increase
c. Decrease
d. Decrease

3

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

4

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

a. Fenestrations
b. Clefts
c. Cytoplasmic Vesicles

5

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)
b. Exocytosis
c. Clefts and fenestrations

6

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

1. Filtration
2. Reabsorbtion

7

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

8

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

a. High
b. into

9

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

12

10

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

a. Diffusion
b. Fenestrations and/or clefts
c. Fenestrations and/or clefts
d. Fenestrations and/or clefts