__________ (cells) secrete hydrochloric acid that breaks down bone and releases calcium and phosphate into the blood.
Fill in the blank(s) with the appropriate word(s).
Osteoclasts
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Structure I is composed of
A) actin and perimysium.
B) actin and myosin.
C) troponin and tropomyosin.
D) only myosin heads.
E) acetylcholine and cholinesterase.
Before parturition,
A. the uterus stretches, causing the release of ACTH from the adenohypophysis. B. the placenta secretes increased amounts of oxytocin. C. fetal glucocorticoids decrease the production of progesterone by the placenta. D. prostaglandin synthesis is inhibited. E. there is an increase in the stimulatory effects of progesterone on the uterine muscle.
Physiological contracture
A. occurs when muscles are resting. B. is a condition in which cross-bridges cannot release. C. is caused by an abundance of ATP in muscle fibers. D. results when muscles are well exercised. E. results when the neurotransmitter remains in the receptor.
________________________________________ nerves transport impulses up to 50 times faster than nerves without myelin sheaths
Fill in the blank(s) with correct word