Mesangial cells help keep the basement membrane clean by
A. secreting emulsifying agents that dissolve trapped particles.
B. engulfing macromolecules caught in its basement membrane.
C. opening larger pores in the membrane so that trapped particles move accross.
D. secreting antibodies that attack the molecules caught in the endothelium.
B
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Which hormone stimulates Leydig cells to secrete testosterone?
a) GnRH b) LH c) Inhibin d) DHT e) None of these choices
Creatine phosphate
A) Is produced by the process of anaerobic respiration. B) Can replace ATP in binding to myosin molecules during contraction. C) Acts as an energy reserve in muscle tissue. D) Is only formed during strenuous exercise. E) Cannot transfer its phosphate group to ADP.
The movement of a substance from an area of high concentration to an area of less concentration is called
A. endocytosis. B. osmosis. C. diffusion. D. facilitated diffusion. E. active transport.
Tendon sheaths are similar to bursae in structure, but wrap tendons in areas where they receive a great deal of frictional wear and tear, such as the wrists and ankles, and where tendons pass through synovial cavities.
a. true b. false