If blood calcium levels rise above 11mg/dL which hormone is likely to be activated?
A) parathyroid hormone
B) estrogen
C) calcitonin
D) calcitriol
E) both calcitriol and parathyroid hormone
C
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In order to stimulate skeletal muscle fibers, motor neurons release the neurotransmitter ________.
Fill in the blank(s) with the appropriate word(s).
During the resting state of a voltage-gated Na+ channel,
1. the inactivation gate is open. 2. the activation gate is closed. 3. the channel is permeable to Na+. a) 1 only b) 2 only c) 3 only d) both 1 and 2 are true. e) all of these choices are true.
Which of the following is not true of triglycerides?
a. A part of the molecule attracts water. b. The molecule contains three fatty acids. c. The molecule contains glycerol. d. Triglycerides are used by the body to store energy.
Channel proteins
A. provide a tunnel through which ions or molecules can enter or leave the cell. B. are binding sites for other molecules. C. utilize the G protein complex to function. D. are found only on endoplasmic reticulum. E. allow cells to recognize one another.