Physiology · Immune System · Easy

Histamine

Meaning: A chemical released by mast cells that dilates blood vessels, increases permeability and causes itching in allergic reactions.

In practice: Histamine release after the bee sting caused a red, itchy wheal around the site.

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Two questions on related physiology words.

Which word means: Unmineralised organic bone matrix laid down by bone-forming cells before it calcifies.

Which word means: An amino acid that acts as a major inhibitory neurotransmitter in the brainstem and spinal cord.

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