The renal process whereby substances are selectively transferred from the peritubular blood into the renal tubule is
a. filtration
b. secretion
c. reabsorption
d. excretion
e. none of these
B
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The sodium-potassium ion exchange pump
A) is not involved in producing the resting membrane potential. B) transports sodium ions into the cell during depolarization. C) transports potassium ions out of the cell during repolarization. D) moves sodium and potassium opposite to the direction of their electrochemical gradients. E) depends on a hydrogen gradient for energy.
To be considered an organic molecule a substance must contain ________.
A. carbon and nitrogen B. carbon and hydrogen C. oxygen and hydrogen D. carbon and oxygen
Which of the following is not a plexus of the vagus nerve?
A) cardiac B) pulmonary C) celiac D) esophageal
The amount of keratin protein produced during keratinization determines hair color
Indicate whether the statement is true or false