Explain the differences between receptor up-regulation and down-regulation including the conditions under which a
cell would use one rather than the other. What will be an ideal response?
Concepts to Consider: Receptor synthesis versus degradation; target cell sensitivity versus insensitivity; the insulin receptor
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In order for an earthworm to lengthen several contiguous segments of its body, it must
A. contract its longitudinal muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm. B. contract its circular muscles, which pulls up the chaetae and moves the body fluid parallel to the long axis of the worm. C. contract its longitudinal muscles, which pulls up the chaetae and moves the body fluid perpendicular to the long axis of the worm. D. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid perpendicular to the long axis of the worm. E. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm.
The most common intestinal disorder is
a. ulcers. b. appendicitis. c. Crohn's disease. d. diverticulitis. e. irritable bowel syndrome.
What type of force moves water up a tree, from its roots to its leaves?
A) pushing B) pulling C) pumping D) positive pressure
In each nephron of the kidney, the glomerulus and Bowman's capsule __________.
a. filter the blood and capture the filtrate b. reabsorb water into the blood c. break down harmful toxins and poisons d. reabsorb salts and nutrients e. refine and concentrate the urine for excretion