Arrival of an action potential at a presynaptic cell's axon terminals triggers the release of __________, a type of

chemical signal. Fill in the blank(s) with the appropriate word(s).


ANSWER: neurotransmitter

Biology & Microbiology

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Which of the following statements is false?

A. Circulation requires a pump to generate pressure to drive flow, whereas ventilation does not. B. Ventilation maximizes the concentration of oxygen in the air on the outside of the respiratory surface. C. The same amount of oxygen enters the blood through diffusion as is transported by circulation. D. Oxygen and carbon dioxide both move across the respiratory surface by diffusion. E. Larger, more complex animals rely on bulk flow and diffusion to deliver oxygen to their cells, whereas some simpler animals rely on diffusion alone.

Biology & Microbiology

Most organ transplants fail because

a. of poor vascular connection between host and donor tissue. b. the migrating leukocytes attack the tissue adjacent to the transplant. c. of the activity of cytotoxic T cells. d. introduced tissues produce antibodies that cause a massive reaction. e. of all of these.

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An enzyme is a protein that catalyzes chemical reactions.

a. true b. false

Biology & Microbiology

Fate of catabolism products

What will be an ideal response?

Biology & Microbiology