A hormone is a ________ and the target cell is ________.
A. molecule; a cell that does not have receptors
B. molecule that has a metabolic effect on another cell; a cell that has receptors for specific hormones
C. protein that stimulates other cells; the source of hormone secretions
D. regulatory molecule that controls secretions of other cells; a cell that synthesizes hormones
Answer: B
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The refractory period:
1.prevents the retrograde propagation of Action Potentials along the neuronal membrane 2.prevents the retrograde propagation of Graded Potentials along the neuronal membrane 3.results from actions of the Na+/K+ pump 4.Both 1 and 3 are correct. 5.All of these are correct.
The autonomic nervous system includes peripheral nerves and ganglia.?
Indicate whether the statement is true or false
Exposure to irritants causes mucus production to
A. increase. B. decrease.
The skin carries out the first step in the synthesis of vitamin D.
Answer the following statement true (T) or false (F)