Describe action potentials
What will be an ideal response?
Action potentials are brief, rapid, large (100-mV) changes in membrane potential during which the potential actually reverses so that the inside of the excitable cell transiently becomes more positive than the outside. As with a graded potential, a single action potential involves only a small portion of the total excitable cell membrane. Unlike graded potentials, however, action potentials are conducted, or propagated, throughout the entire membrane nondecrementally -- that is, they do not diminish in strength as they travel from their site of initiation throughout the remainder of the cell membrane.
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What role does prolactin play in reproductive behavior?
What will be an ideal response?
Cardiac muscle tissue makes up all of the following portions of the heart except
A. the chordae tendineae. B. the trabeculae carneae. C. the myocardium of the walls of the heart chambers. D. the papillary muscles. E. the pectinate muscles.
The femoral artery gives rise to all of the following arteries, EXCEPT the:
A. iliac arteries. B. popliteal arteries. C. dorsalis pedis arteries. D. posterior tibial arteries.
Which statement best describes how the skin works with the nervous system?
A. Neurons stimulate melanocytes to change the pigment of the skin. B. Neurons detect sensations and control glands and arrector pili. C. Neurons detect the presence of bacteria and viruses. D. Neurons control clot formation and inflammation.