The relatively simple excretory system used by flatworms consists of tubules called ____
a. nephrons
b. hepatic tubules
c. metanephridia
d. Malpighian tubules
e. protonephridia
ANSWER: e
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What diffuses across the narrow synaptic cleft between the presynaptic axon and the postsynaptic cell to transmit a nerve impulse?
A. neurotransmitter B. electrical impulse C. Na+ ion D. vesicle E. action potential
The term that is the culmination of coitus is ____
a. sexual arousal b. fertilization c. ejaculation d. orgasm e. sexual intercourse
An individual adaptive zone can be occupied by how many different species?
a. one b. two c. hundreds d. thousands e. an infinite number
Please match the diseases with their most common portal of exit.
Tuberculosis, Influenza A) Respiratory tract (aerosols) B) GI tract (saliva droplets) C) Exudates from skin lesions D) GI tract (diarrhea) E) Reproductive tract (semen) F) Blood through a contaminated needle