Which is not correct regarding the innervation of the kidney?
A. Parasympathetic innervation is from the vagus nerve.
B. Sympathetic innervation is from segments T10-T12 of the spinal cord.
C. Sympathetic stimulation causes vasoconstriction of the renal blood vessels.
D. The kidney is served by the renal plexus.
E. Parasympathetic stimulation decreases the rate of filtrate formation.
Answer: E
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Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours. This enhanced ability of the sperm to fertilize the ovum is called capacitation. In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum. These observations suggest that
A) pH is an important factor in the process of capacitation. B) in capacitation, secretions of the female reproductive tract are taken up by the sperm. C) only sperm that come into contact with vaginal secretions are capable of fertilizing an ovum. D) capacitation is temperature-dependent. E) capacitation involves the removal of some inhibiting substance(s) from the sperm.
Dried bone consists of 70% ________________________________________ and 30% ________________________________________ material
Fill in the blank(s) with correct word
Long bones increase in width and other bones increase in size or thickness because of ______ growth beneath the periosteum.
a. interstitial b. appositional
Which cell is the most important in the initial activation of the immune system?
a. B cell b. Helper cell c. Macrophage d. T cell