The ________ passes through the ________
A) vagus nerve; foramen magnum
B) optic nerve; foramen ovale
C) vestibulocochlear nerve; external acoustic meatus
D) internal jugular vein; jugular foramen
E) internal carotid artery; jugular foramen
D
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Which layer of blood vessels contains smooth muscle?
A) tunica externa B) tunica intima C) tunica media D) None of the listed responses is correct.
The ____________________ signaling of the autonomic nervous system controls the vasomotor responses of the skin
Fill in the blank(s) with correct word
A slightly mobile joint is referred to as a(n) _________
Fill in the blank with correct word.
A positive feedback loop occurs when the outcome of an event causes the event to continue occurring and amplifies its effects. Which of the following aspects of an action potential constitutes a positive feedback loop?
A. Opening of voltage-gated sodium channels causes voltage-gated potassium channels to open and release potassium to the extracellular environment, slowly counteracting sodium influx. B. The sodium-potassium pump exactly balances ion leaks by pumping three sodium and two potassium ions across the membrane. C. An initial flow of sodium ions into the neuron opens voltage-gated sodium channels, rapidly causing more sodium to enter. D. The threshold potential is around -55mV.