The various classes of immunoglobulins are differentiated on the basis of their
A) asymmetry.
B) antigen specificity.
C) light-chain variable segments.
D) heavy-chain constant segments.
E) reactivity.
D
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When chemically-gated Na+ channels open, the membrane
a. hyperpolarizes b. repolarizes c. depolarizes d. becomes more negative e. is inhibited
The endoderm forms
A) muscle. B) blood. C) neural tissue. D) skin. E) the urinary bladder.
Rods and cones are evenly distributed throughout the entire retina.
Answer the following statement true (T) or false (F)
What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
A) Diffusion of ions along the axoplasm is faster. B) There are no internodes in unmyelinated fibers. C) There are more internodes in unmyelinated fibers. D) Facilitated diffusion of sodium and potassium is faster in myelinated fibers. E) Active transport of sodium and potassium is faster in myelinated fibers.