Which of the following statements is true concerning feedback mechanisms?
A) Positive feedback mechanisms always result in excessive damage to the host.
B) Negative feedback mechanisms tend to increase the original stimulus.
C) Negative feedback mechanisms work to prevent sudden severe changes within the body.
D) Blood glucose levels are regulated by positive feedback mechanisms.
C) Negative feedback mechanisms work to prevent sudden severe changes within the body.
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Erythropoietin is a hormone produced by the ________ to increase the rate of production and maturation of erythrocyte progenitor and erythroblast cells.
Fill in the blank(s) with the appropriate word(s).
Damage to the tectorial membrane near the oval window would limit an individual's ability to detect high frequency sounds.
Answer the following statement true (T) or false (F)
In edema
A) tissues swell with fluid. B) blood clots inappropriately. C) the body shrivels from dehydration. D) monocytes dominate the blood.
Which of the following statements concerning vitamin D is incorrect?
a. It can be synthesized by the skin on exposure to sunlight. b. It must be modified by alterations in the liver and kidneys before it is biologically active. c. It enhances the effect of calcitonin on bone. d. It increases Ca2+ absorption in the intestine. e. Its deficiency in children results in rickets.