Adrenaline accelerates the rate of the heart beat by acting to excite the sinoatrial primary pacemaker of the heart.
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An example of adrenaline action in the nervous system is increased alertness and improved focus during a fight-or-flight response. Adrenaline activates the sympathetic nervous system, leading to enhanced sensory perception and rapid decision-making to help the body respond to a perceived threat.
It sends messages that control all the systems in the body. The nervous system controls almost every action in the human body. It controls the heart beat, your adrenaline levels, and many other things which can effect an organism.
The adrenal medulla develops from the sympathetic nervous system. It is responsible for secreting hormones such as adrenaline (epinephrine) and noradrenaline (norepinephrine) in response to stress or danger.
The effect of epinephrine mimics the effect of the sympathetic nervous system. Epinephrine is also known as adrenaline, and it activates the "fight or flight" responses in the body, such as increasing heart rate, dilating airways, and increasing blood flow to muscles.
norepinephrine/noradrenaline working in tandem with epinephrine/adrenaline
The adrenal gland is an organ of the endocrine system that interacts with the nervous system. It is responsible for producing hormones such as adrenaline in response to stress, which can trigger a fight-or-flight response mediated by the nervous system.