Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:
a. opening gated channels.
b. opening a gated channel through activation of a G protein.
c. activation of the adenylyl cyclase system.
d. binding to sites and then being endocytized.
e. ultimately activating protein kinases.
D
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________ constitutes about 80% of circulating antibodies in plasma
A) IgG B) IgD C) IgM D) IgA E) IgE
The pharynx bifurcates into the ____________________ anteriorly, and the ____________________ posteriorly.
Fill in the blank(s) with the appropriate word(s).
A solution with a pH of 8 is more acidic than one with a pH of 3
Indicate whether the statement is true or false.
When is the generation of an action potential impossible, no matter the strength of the stimulus?
A) absolute refractory period B) threshold C) depolarization D) relative refractory period