An action potential does not re-stimulate the adjacent membrane that was previously depolarized because
A. stimulation is inhibited by the myelin sheath.
B. it is impossible for an action potential to be propagated along an axon toward the nerve cell body.
C. the resting membrane potential of the axon is too positive.
D. the resting membrane potential of the axon is too negative.
E. that area of the membrane is in the absolutely refractory period.
E
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Each of the following is a physical barrier to infection except
A) body hair. B) epithelium. C) secretions. D) complement. E) basement membranes.
What does a hepatic triad consist of?
A. The right, left, and common hepatic ducts B. The common hepatic duct, cystic duct, and bile duct C. The hepatic portal vein and two hepatic ducts D. A bile ductule, a branch of the hepatic artery, and a branch of the hepatic portal vein E. A central vein, a hepatic lobule, and a hepatic sinusoid
The lower chambers of the heart are _____ and _____.
A) atria; pump blood within the heart B) atria; pump blood out of the heart C) ventricles; pump blood within the heart D) venticles; pump blood out of the heart.
Covalent bonds form when ________.
A. two or more atoms share electrons equally B. two or more molecules share electrons unequally C. two or more atoms share electrons equally and two or more molecules share electrons unequally D. a positive ion and a negative ion attract