For the resting membrane potential to be reestablished after a series of action potentials,
A) activation gates of voltage-gated Na+ ion channels are closed.
B) inactivation gates of voltage-gated Na+ ion channels are open.
C) voltage-gated K+ ion channels are closed.
D) the sodium-potassium exchange pump is functioning.
E) all of these
Answer: E) all of these
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Aqueous humor is drained by the ________
A) iris B) scleral venous sinus C) sclera D) ciliary body
The advantage of having many nuclei in a skeletal muscle fiber is the ability to
A) contract. B) produce more ATP with little oxygen. C) store extra DNA for metabolism. D) produce large amounts of the muscle proteins needed for muscle contraction. E) All of the answers are correct.
When a single presynaptic neuron repeatedly releases neurotransmitter in a very short period of time, it results in ________ summation in the postsynaptic neuron.
Fill in the blank(s) with the appropriate word(s).
A surgeon needs to be familiar with different versions of anatomy. This is because of the phenomenon of ________.
A. holistic medicine B. physiological variation C. anatomical variation D. cellular adaptation