Neurotransmitters and neurohormones both
A) affect only cells with a specific receptor.
B) are released by neurons and affect only cells with specific receptors.
C) are released by neurons.
D) travel in the blood to their target cell.
E) are produced by all cells.
B) are released by neurons and affect only cells with specific receptors.
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A round or oval hole through a bone that contains blood vessels and/or nerves is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Being able to generate more force with a muscle could include variations in motor unit recruitment or muscle cell hypertrophy.
Answer the following statement true (T) or false (F)
Which of the following statements about thermoregulation is correct?
a. in a cold environment, the body will lose heat by conduction, convection, radiation, and evaporation. b. in a hot environment when the temperature of the environment exceeds that of the skin surface, evaporation is the only means for the body to lose heat. c. the temperature control centers in the hypothalamus receive afferent input from peripheral thermoreceptors in the skin and central thermoreceptors in the hypothalamus and internal organs. d. both (b) and (c) above. e. all of these answers.
What action is most responsible for the resting membrane potential in cardiac muscle cells?
A. Movement of Ca2+ through voltage-gated Ca2+ channels. B. Closing of Na+ and K+ voltage-gated channels C. Movement of K+ through voltage-gated K+ channels D. Movement of Na+ through open Na+ channels