What bridges the gap between a neuron sending a message and the neuron receiving it?

A. Threshold value
B. Action potential
C. Neurotransmitter
D. Cytoplasm
E. Dopamine


Answer: C

Biology & Microbiology

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An enzyme that breaks down protein is

A. lipase. B. lactase. C. pepsin. D. amylase. E. bile.

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__________________, is the first number listed in blood pressure readings, measures the force of the left ventricle contraction.

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

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Human reproductive systems are best described as

A) perfect. B) dioecious. C) hermaphroditic. D) budding.

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The major function of the protonephridia in the flatworm is to:

a. conserve water. b. conserve salts. c. eliminate waste materials such as ammonia and urea. d. eliminate excess water. e. regulate the pH of the gastrovascular cavity.

Biology & Microbiology