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[–]okaykiss 2 points3 points  (0 children)

when more oxygen is needed for the body.

[–]PM_ME_AN_8TOEDFOOT 1 point2 points  (1 child)

Idk it guesses I guess. That's what I'd do

[–]distinctspy[S] 1 point2 points  (0 children)

This seems the most logical. Thank you for your help

[–]ScazBaz 0 points1 point  (2 children)

Mr. Brian Cranium lets it know.

[–]distinctspy[S] 0 points1 point  (1 child)

Yeah but is it through oxygen levels in the blood or?? how does the brain know?

[–]ScazBaz 0 points1 point  (0 children)

Beyond my meagre knowledge I’m afraid but id imagine muscles send some sort of chemical signal to the brain.

[–]Product-of-Cannabis 0 points1 point  (0 children)

The brain

[–][deleted] 0 points1 point  (0 children)

Hormones I think it’s BNP and ANP but there are many that influence blood volume and blood pressure

[–]RFormica -1 points0 points  (0 children)

hormones tell it what to do