When a depolarizing graded potential makes the axon membrane depolarize to threshold,
a) ligand-gated Ca+2 channels close rapidly.
b) voltage-gated Ca+2 channels open rapidly.
c) ligand-gated Na+ channels close rapidly.
d) voltage-gated Na+ channels open rapidly.
e) none of these choices occur.
d
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The complement system works closely with and complements the action of
A) interferons. B) antibodies. C) pyrogens. D) phagocytes. E) microphages.
Triglycerides and steroids are both examples of
A. essential amino acids. B. nonessential amino acids. C. lipids. D. carbohydrates. E. proteins.
Viscosity refers to the friction developed between the molecules of a fluid as they slide over each other during flow of the fluid
a. True b. False Indicate whether the statement is true or false
These two vessels combine to form the superior vena cava
A- renal and suprarenal veins B- iliac veins and lumbar veins C- basilic and cephalic veins D- right and left brachiocephalic