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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A slightly mobile joint is referred to as a(n) _________
Fill in the blank with correct word.
The ____________________ signaling of the autonomic nervous system controls the vasomotor responses of the skin
Fill in the blank(s) with correct word
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.
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.