During exercise, blood flow to the active skeletal muscles is increased by autoregulation. Propose a mechanism based on the need for nutrients that would explain how the autoregulation might take place.
What will be an ideal response?
When a skeletal muscle becomes more active, it has an increased demand for nutrients such as oxygen and glucose
and quickly removes these from the surrounding interstitial fluid. This leaves fewer nutrients available for other
cells that share the same interstitial fluid, such as the smooth muscle cells of the precapillary sphincter. As the
available nutrients decline, energy production in the precapillary sphincters cannot keep pace with the need to
keep the muscle in a contracted state, and the sphincters begin to relax. As they relax, the opening to the capillary
becomes larger so that more blood flows into the capillary network that serves the skeletal muscle.
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People suffering mineral deficiencies sometimes compulsively eat non-nutritive substances, such as laundry starch, dirt, hair, and clay. This condition is called
A. obsessive-compulsive disorder. B. pernicious anemia. C. anorexia. D. pica.
The three major subdivisions of a cell are the ____________________, the ____________________, and the ____________________
Fill in the blank(s) with correct word
What are the gaps between myelinated segments of an axon called?
A. Satellite gaps B. Synaptic clefts C. Tangled plaques D. Myelin sheath gaps E. Myelin gaps
Which of these is a function of the skeletal system?
a. creation of the structural framework within soft organs of the body b. communication system c. removal of old or damaged blood cells d. storage site for calcium