In response to parasympathetic stimulation, ________.
A. heart rate increases
B. the pupils dilate
C. saliva thickens
D. intestinal motility increases
Answer: D
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Shortly following DNA replication is a brief
A) G3 phase. B) anaphase. C) G2 phase. D) synthesis phase. E) G1 phase.
Increased permeability of the postsynaptic cell to Cl- lessens the likelihood that the postsynaptic cell will undergo an action potential
Indicate whether the statement is true or false
Which of the following choices most accurately represents the sequence of steps occurring in the contraction cycle? The events numbered 1 through 6 may be used more than once. 1 . Mysoin binds ATP 2 . Mysoin hydrolyzes ATP and goes into cocked position 3 . Myosin releases ADP and inorganic phosphate 4 . Myosin binds actin filament 5 . Power stroke 6 . Myosin releases actin filament
a. 1, 2, 3, 4, 5, 6, 1 b. 1, 2, 4, 3, 5, 1, 6 c. 1, 6, 2, 4, 3, 5, 1, 6 d. 1, 2, 6, 3, 4, 5, 6, 1 e. None of these.
To initiate a smooth muscle cell contraction, calcium enters the cell and binds to
A. troponin, which then activates myosin light-chain kinase. B. calmodulin, which then binds to and activates myosin light-chain kinase. C. myosin light-chain kinase, which then hydrolyzes ATP. D. a phosphatase, which then removes the tropomyosin blockade. E. a myosin head, which then activates calmodulin.