Airborne chemicals are most likely to stimulate ________
A) olfactory receptors
B) taste receptors for umami
C) olfactory receptors, taste receptors for umami, and taste receptors for bitter
D) taste receptors for bitter
Answer: A
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Conduction occurs along an axon because
A) inflow of Na+ triggers the adjacent channels to open. B) outflow of K+ triggers the adjacent channels to open. C) axonal transport "walks" voltage changes along the membrane. D) once Na+ enters the cell, the entire membrane depolarizes simultaneously.
When Golf is activated, which of the following steps in the olfactory cells contribute to their depolarization?
A) increases in adenylate cyclase activity, cAMP concentrations and closure of cAMP gated cation channels B) increases in cAMP concentrations only C) increases in the closure of cAMP gated cation channels only D) increases in adenylate cyclase only E) increases in adenylate cyclase activity and cAMP concentrations
Of the nine regions used by anatomists to divide the abdominopelvic cavity, this one is most superior and medial
A) hypogastric B) umbilical C) epigastric D) lumbar
The figure illustrates changes in the membrane potential during an action potential. What does "D" represent?
A. Local potential B. Repolarization C. Afterpotential D. Depolarization E. Threshold