The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the
A) hydrolysis of ATP only.
B) removal of Ca2+ ions from the sarcoplasm only.
C) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes.
D) movement of Na+ across their membranes only.
E) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP.
B) removal of Ca2+ ions from the sarcoplasm only.
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According to the equation expressed as Ohm's law, which of these would cause the greatest increase in current?
A. Reducing voltage by half and doubling resistance B. Quadrupling both voltage and resistance C. Doubling both voltage and resistance D. Reducing both voltage and resistance by half E. Doubling voltage and reducing resistance by half
Which of the following structures is not part of the renal corpuscle?
a. loop of Henle b. Bowman’s capsule c. glomerulus d. all of the above are part of the renal corpuscle
The primary stimulus for insulin secretion is ________.
increased blood glucose concentrations increased blood calcium concentrations increased body temperature increased exposure to sunlight
The process of eliminating those lymphocytes that react or respond against self-antigens is called
A. phagocytosis. B. inflammation. C. negative selection. D. activation of complement. E. natural selection.