People who live in a Scandinavian country—Norway, Sweden, or Finland—may have bigger problems with porous bone or osteoporosis. Remember that the extreme northern and southern latitudes of the earth get less direct sun. How is porous bone in any way related to sun exposure?
What will be an ideal response?
Less sun exposure means less vitamin D3 production in the skin. Less vitamin D3 means there is less calcitriol hormone, which is necessary for calcium absorption in the small intestine. This causes blood calcium levels to drop. Less deposition of calcium in bone results in porous bone, which produces weak bone that can break easily.
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Define cardiopulmonary resuscitation (CPR)
What will be an ideal response?
What are the three major stages of spermatogenesis?
a. mitotic proliferation, sperm differentiation, and delivery b. testosterone secretion, sperm differentiation, and packaging c. mitotic proliferation, meiosis, and packaging d. testosterone secretion, meiosis, and packaging e. mitotic proliferation, meiosis, and delivery
A structure that allows the middle ear to communicate with the nasopharynx is the
A) pinna. B) vestibular duct. C) tympanic duct. D) auditory tube. E) external auditory canal.
The right lung has ________; the left lung has ________
A) three lobes; two lobes B) two lobes; two lobes C) two lobes; three lobes D) three lobes; three lobes E) None of the answers is correct.