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.
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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.
What is the first milk that is produced after birth called?
A. prolactase B. colostrum C. hCG D. chorionic lactase E. allantoicase
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.
Positive feedback mechanisms enhance changes in the body
Indicate whether the statement is true or false