What structure helps to regulate body temperature?
A. glomus
B. tunic
C. fenestrae
D. metarteriole
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Question 2) In a capillary bed, relaxation of the precapillary sphincter
A. causes more blood flow through thoroughfare channels.
B. causes less blood to flow through capillaries.
C. occurs when the tissue in the area does not need more oxygen.
D. is voluntary.
E. occurs when the tissue in the area needs more oxygen.
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Question 3) Which statement about precapillary sphincters is CORRECT?
A. They contract when oxygen levels in the tissue are low.
B. They can close off the capillaries by contracting.
C. They are openings that allow large molecules and blood cells to leave the capillary.
D. When the precapillary sphincters are open, blood flows only through the thoroughfare channels.
E. They are voluntary.
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Question 4) A direct connection between an arteriole and a venule without an intervening capillary bed is a(an)
A. venous sinus.
B. arteriovenous anastomosis.
C. metarteriole.
D. arterial capillary.
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Question 5) Precapillary sphincters
A. serve as valves in veins.
B. are found in the tunica media.
C. carry blood under high pressure.
D. control the blood flow into capillary beds.
E. are voluntary structures.
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Question 6) Capillary walls serve as effective permeability barriers for
A. oxygen and carbon dioxide.
B. electrolytes.
C. glucose.
D. proteins.
E. small water-soluble molecules.
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Question 7) Which type of capillary has the largest diameter?
A. sinusoids
B. continuous capillaries
C. sinusoidal capillaries
D. venous sinuses
E. fenestrated capillaries
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Question 8) Continuous capillaries
A. have many thin areas called fenestrae.
B. are freely permeable to large molecules such as hormones.
C. have a wall where the endothelial cells fit very tightly together.
D. are more permeable then fenestrated capillaries but not as permeable as sinusoidal capillaries.
E. are characterized by continuous pores.
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Question 9) Which of the following organs would be most likely to contain fenestrated capillaries?
A. spleen
B. kidney
C. bone marrow
D. muscle
E. pancreas
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Question 10) Which type of capillaries have large fenestrae and are found in endocrine glands?
A. sinusoidal capillaries
B. continuous capillaries
C. fenestrated capillaries
D. sinusoids
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