Biology, 27.07.2019 07:00, dbhuggybearow6jng

Develop in two phases: (1) blood vessels in the brain narrow, so that the flow of blood to parts of the brain is reduced, and (2) the same blood vessels later expand, so that blood flows through them rapidly, stimulating many neuron endings and causing pain.

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Develop in two phases: (1) blood vessels in the brain narrow, so that the flow of blood to parts of...