The terminals of both autonomic nerve fibers and motor neurons end in a single, enlarged knoblike structure that releases neurotransmitter.
Indicate whether the statement is true or false
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Question 2) Plasma clearance is the
a. time required to filter blood in the glomerulus.
b. amount of a substance appearing in the urine in one minute of time.
c. amount of a substance that is filtered in one minute of time.
d. amount of a substance secreted in one minute of time.
e. volume of plasma that is completely cleared of a substance by the kidneys in one minute of time.
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Question 3) Most innervated blood vessels receive only sympathetic nerve fibers.
Indicate whether the statement is true or false
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Question 4) Which of the following stimulates aldosterone secretion?
a. an increase in plasma K+.
b. a decrease in plasma K+.
c. activation of the renin-angiotensin pathway.
d. both (a) and (c) above.
e. both (b) and (c) above.
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Question 5) The parasympathetic nervous system controls the secretion of saliva but not sweat.
Indicate whether the statement is true or false
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Question 6) Which substance is normally secreted into the tubule
a. hydrogen ions.
b. potassium ions.
c. organic ions
d. both (a) and (b) above.
e. all of these answers.
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Question 7) The sympathetic nervous system is always excitatory to the organs it innervates.
Indicate whether the statement is true or false
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Question 8) Secretion of organic ions:
a. occurs only for anions, not cations
b. is a highly selective process
c. occurs across all parts of the tubule
d. is regulated by hormones
e. involves the removal of many foreign organic chemicals, including food additives, environmental pollutants, drugs
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Question 9) Myasthenia gravis
a. is an autoimmune disease.
b. occurs when the terminal-button vesicles are unable to release adequate amounts of acetylcholine.
c. can be treated with a drug that temporarily inhibits acetylcholinesterase.
d. both (a) and (c) above.
e. all of these answers.
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Question 10) Secretion of organic ions takes place in the:
a. Bowman's capsule.
b. loop of Henle.
c. proximal tubule.
d. collecting duct.
e. glomerulus.
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