Adrenaline directly affects the . . . . . . | vedclass

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(A) Adrenaline (also known as epinephrine) is a hormone secreted by the adrenal medulla during stress or emergency situations. It acts on various targ

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$SA$ node

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(A) Adrenaline (also known as epinephrine) is a hormone secreted by the adrenal medulla during stress or emergency situations. It acts on various target organs to prepare the body for 'fight or flight' responses. One of its primary targets is the heart,specifically the $SA$ (Sinoatrial) node,which acts as the natural pacemaker. By stimulating the $SA$ node,adrenaline increases the heart rate and the force of contraction,thereby increasing cardiac output to supply more oxygenated blood to the muscles.

Adrenaline directly affects the . . . . . . .

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