When you scratch a mosquito bite, you damage some cells. Damaged cells release histamine, which causes localized swelling that can crush additional cells, causing the release of more histamine. This is an example of

A) positive feedback.
B) negative feedback.
C) neurotransmitter activity.
D) paracrine communication.
E) synaptic communication.


A

Biology & Microbiology

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Salmon fisheries are located in the coastal waters of:

a. Alaska. b. New England. c. the Pacific Northwest. d. China. e. both a and c

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What type of junctional complex will prohibit paracellular transport?

Tight junctions Adherens junctions Desmosomes Gap junctions

Biology & Microbiology

Special-interest groups are not permitted to post information as science on the Internet unless it has undergone peer review

Indicate whether the statement is true or false

Biology & Microbiology

The appearance that the spindle and sister chromatids are inactive at metaphase is misleading because

A) the sister chromatids are completing replication at numerous replicons. B) the sister chromatids are signaling reformation of the nuclear envelope. C) each sister chromatid is assembling a kinetochore. D) each sister chromatid is being pulled toward its respective pole. E) the sister chromatids are decondensing.

Biology & Microbiology