2. The endorphins are a group of naturally occurring neurotransmitters that act in a manner like morphine to control pain. Research has shown that the biologically active parts of the endorphin molecules are simple pentapeptides called enkephalins. Draw the structure of the methionine enkephalin with the sequence Tyr-Gly-Gly-Phe-Met. Identify the N- terminal and C-terminal amino acids.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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2. The endorphins are a group of naturally occurring neurotransmitters that act in a manner

like morphine to control pain. Research has shown that the biologically active parts of the

endorphin molecules are simple pentapeptides called enkephalins. Draw the structure of

the methionine enkephalin with the sequence Tyr-Gly-Gly-Phe-Met. Identify the N-

terminal and C-terminal amino acids.

3. Bradykinin is a nonapeptide that stimulates smooth muscle contraction, dilates blood

vessels, causes pain, and is a component of bee venom. Give the IUPAC name of the

nonapeptide.

4. Some researchers feel that the “high” experienced by runners may be due to the brain’s

synthesis of peptides. Explain why this theory might be a reasonable explanation

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