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maxisa maxisa
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12 years ago
Nervous system messages are said to be conveyed fast, and their effect is immediate. Endocrine control, in comparison, is slower, but its effects last for a longer time. Endocrine messages are slower because

a.hormones are transmitted by carrier molecules that require cellular respiration to generate ATP
b. competitive inhibitors prevent rapid distribution of hormones
c. hormones enter the blood stream and then must be transported throughout the body to target organs
d.some hormones en route to target organs are broken down by cholinesterase
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12 years ago
First one is D
Volunteers are seldom paid; not because they are worthless, but because they are PRICELESS!
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