Exocytosis occurs as a result of
A. ion pumps.
B. molecular movement with carrier assistance.
C. concentration gradients.
D. hydrostatic pressure.
E. the expenditure of energy in the form of ATP.
Answer: E
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When is the thymus gland most active?
A. From ages 45?65 years B. From age 65 years until death C. From ages 25?45 years D. From puberty to adulthood E. From childhood to puberty
Name the technique mentioned in the text for stimulating urination in sheep
What will be an ideal response?
The glomerular filtrate
a. is a protein-free plasma. b. is formed as a result of passive forces acting across the glomerular membrane. c. does not contain foreign compounds because these substances are secreted by special transport mechanisms in the proximal tubule instead. d. both (a) and (b) above. e. all of these answers.
An inhibitory local potential causes which of the following?
A. Hyperpolarization of the plasma membrane B. Neutralization of the plasma membrane C. Depolarization of the plasma membrane D. Repolarization of the plasma membrane E. Drifting of the membrane potential towards the resting membrane potential