Other Types Of Hormones

Many other chemical messengers are now classified as hormones. These substances include neuropeptides and prostaglandins (PRAHS-tuh-GLAN-dinz).

Neuropeptides are hormones secreted by the nervous system. Unlike neurotransmitters, neuropeptides tend to affect many cells near the nerve cells that release them. One group of neuropeptides, called endorphins (en-DAWR finz), regulate emotions, influence pain, and affect reproduction. Another group of neuropeptides, enkephalins (en-KEF-uh-linz), inhibit pain messages traveling toward the brain.

Prostaglandins are modified fatty acids that are secreted by most cells. Prostaglandins accumulate in areas where tissues are disturbed or injured. Some prostaglandins reduce blood pressure; others raise blood pressure. Some prostaglandins cause smooth muscle to relax; others cause smooth muscle to contract. Some prostaglandins cause fever. Aspirin and acetaminophen reduce fever and decrease pain by inhibiting prostaglandin synthesis.

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Responses

  • Christina
    Why are neuropeptides and prostaglandins now classified as hormones?
    2 years ago

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