What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?

A. Closing of the voltage-gated Na+ channel activation gate.
B. Closing of the voltage-gated Na+ channel inactivation gate.
C. Opening of the voltage-gated K+ channel gate.
D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate.
E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.


D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate.

Biology & Microbiology

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Blood is closely maintained at a pH of 7.4. A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma. What happens to the concentration of H+ ions in a patient with a blood pH of 6.4?

A. H+ concentration is decreased 10-fold. B. H+ concentration is decreased 2-fold. C. H+ concentration is increased 10-fold. D. H+ concentration is increased 2-fold. E. H+ concentration is decreased 4-fold.

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What is the first milk that is produced after birth called?  

A.  prolactase B.  colostrum C.  hCG D.  chorionic lactase E.  allantoicase

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Beta amyloid plaques are most often seen in persons suffering from

a. Parkinson's disease. b. Alzheimer's disease. c. heart attacks. d. muscular dystrophy. e. multiple sclerosis.

Biology & Microbiology

Positive feedback mechanisms enhance changes in the body

Indicate whether the statement is true or false

Biology & Microbiology