Souce:
Adrenal glands (on top of the kidneys)
Role:
Readies the body for a 'fight or flight' response
Effects:
Increases heart rate, blood flow to muscles and blood sugar level
It does this by binding to specific receptors in the heart, causing the cardiac muscle to contract more frequently and with more force, so heart rate increases and the heart pumps more blood. This increases oxygen supply to the tissues, getting the body ready for action.
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