Which one of the following nonhormonal chemical messengers is important in local control of blood flow and blood clotting?

A) prostaglandins
B) nerve growth factor
C) tumor angiogenesis growth factor
D) histamine
E) epidermal growth factor


A

Biology & Microbiology

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When an enzyme linked receptor is activated, a conformational change activates the extracellular

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In the process of organismic respiration:a

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Clonal selection and differentiation of B cells activated by antigen exposure leads to the production of _____

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Biology & Microbiology