Which must happen in order for an action potential to begin?
A. The membrane potential must be at the Na+ equilibrium potential.
B. Na+ influx must exceed K+ efflux.
C. The membrane must be out of the relative refractory period.
D. Na+ channels must all be inactivated.
E. Multiple inhibitory postsynaptic potentials (IPSPs) must summate.
B
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A) LH. B) estrogen and progesterone. C) human chorionic gonadotropin. D) FSH. E) relaxin.
NE can cause inhibition of certain effectors by functioning as an autonomic antagonist
Indicate whether the statement is true or false
A patient comes into the emergency room with weakness on one side and difficulty walking and talking. You determine that the brain has been deprived of oxygen due to lack of regional blood flow. You suspect that patient has most likely experienced
A) a subdural hemorrhage. B) meningitis. C) hydrocephalus. D) cranial trauma. E) a cerebrovascular accident.
In the following superior illustration of the interior of the base of the skull, the arrow points to which of the following cranial nerves?
A) olfactory B) oculomotor C) trochlear D) maxillary E) abducent