(B) The hormone $Adrenaline$ (also known as $Epinephrine$) is secreted by the adrenal medulla in response to stress or excitement. It acts on the $SA$

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(B) The hormone $Adrenaline$ (also known as $Epinephrine$) is secreted by the adrenal medulla in response to stress or excitement. It acts on the $SA$ node of the heart to increase the heart rate and the force of contraction, preparing the body for a 'fight-or-flight' response.