Which of the following is true regarding red blood cells?
A) They are anucleate.
B) They survive for approximately one year.
C) They have a biconvex shape.
D) They are produced in the spleen.
E) They primarily carry carbon dioxide.
A
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Unipolar neurons have axons structurally divided into peripheral and central processes
Indicate whether the statement is true or false
To increase the amount of neurotransmitter released onto a postsynaptic cell, the presynaptic cell would have to
A) send action potentials with longer durations. B) send action potentials with higher voltage (higher amplitude). C) send action potentials with higher frequency. D) do nothing; no change is possible since the all-or-none law is in effect.
The somatic and autonomic nervous systems differ in all of the following EXCEPT ________
A) their effectors B) target organ responses to their neurotransmitters C) regulation of activity by higher brain centers D) their efferent pathways and ganglia
Which of the following foods tends to help lower cholesterol levels??
A) ?Eggs B) ?Liver C) ?Beef D) ?Oat bran