A threshold stimulus applied to an excitable membrane is one that is just sufficient to
A. trigger an excitatory postsynaptic potential.
B. be conducted to the axon hillock.
C. cause a change in membrane potential.
D. trigger an action potential.
E. depolarize a dendrite.
Answer: D
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Potassium has a higher concentration
A. outside the cell versus inside the cell, whereas sodium has a higher concentration inside versus outside the cell. B. inside the cell versus outside the cell, and sodium is also more concentrated inside versus outside the cell. C. inside the cell versus outside the cell, whereas sodium has a higher concentration outside versus inside the cell. D. outside the cell versus inside the cell, and sodium is also more concentrated outside versus inside the cell.
The pancreas has both endocrine and exocrine functions.
Answer the following statement true (T) or false (F)
____________ Glands secrete mucin, which combines with water to form a thick and sticky product, whereas ______ glands produce a relatively watery fluid.
A) Mucous; serous. B) Merocrine; holorime. C) Apocrine; mixed. D) Endocrine; exocrine. E) Serous; mucous.
The appearance of pubic and axillary hair is characteristic of which stage of puberty?
A. Climacteric B. Menopause C. Pubarche D. Menarche E. Thelarche