Which is TRUE about receptor potentials?
A. They vary in magnitude with stimulus strength.
B. They propagate without decrement.
C. They generally occur at the axon hillock of afferent neurons.
D. They are action potentials.
E. They always trigger action potentials.
Answer: A
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The chemical behavior of an atom is determined by the
A) number of protons. B) number of neutrons. C) outermost electron shell. D) size of the atom. E) mass of the nucleus.
Most commonly, a synapse is made between a
A. presynaptic neuron's axon hillock and a postsynaptic neuron's cell body. B. presynaptic neuron's soma and a postsynaptic neuron's synaptic knob. C. presynaptic neuron's dendrite and a postsynaptic membrane's cell body. D. presynaptic neuron's axon and a postsynaptic neuron's dendrite.
The muscle that encircles the lips and enables them to pucker, as in a kiss, is the orbicularis ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is mismatched?
A. Epididymis - site of sperm maturation B. Stereocilia - forms sperm cell tails C. Spermatic cord - passes through inguinal canal D. Midpiece - mitochondria E. Ductus deferens - vas deferens