The release of neurotransmitter from the presynaptic cell is an example of:
A. phagocytosis.
B. endocytosis.
C. transcytosis.
D. exocytosis.
D
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For a fish, what circumstances necessitate drinking water?
a. all of the choices b. solute concentration of body greater than surroundings c. solute concentration of body less than surroundings d. solute concentration of body equal to surroundings
Cardiac muscle cells are
a. involuntary. b. spindle-shaped. c. multinucleated. d. slow contracting. e. all of these.
Foreign cells that enter the human body have unique cell surface proteins, known as ________, which stimulate the body's defense to attack
A) leukocytes B) Rh factors C) antibodies D) platelets E) antigens
What is one drawbacks to using pheromones for communication?
a. They are effective only at night. b. They can only affect unrelated species. c. They are toxic to unrelated species. d. They require little energy for production. e. They transmit information slowly.