Why does a person's heart beat faster when he or she is nervous?
Please be as scientific as you can. Thanks =)
Answer:
Adrenaline is released.
Adrenaline is a "fight or flight" hormone which is released from the adrenal glands whenever danger threatens. When secreted it floods out the endocrine gland into the bloodstream to instantly prepare the body for action in emergency situations. The hormone boosts the supply of oxygen and energy-giving glucose to the muscles making the individual more mentally alert and physically strong; only vital bodily processes occur.
Adrenaline plays a central role in the short-term stress reaction—the physiological response to threatening, exciting, or environmental stressor conditions such as high noise levels or bright light (see Fight-or-flight response). It is secreted by the adrenal medulla. When released into the bloodstream, Adrenaline binds to multiple receptors and has numerous effects throughout the body. It increases heart rate and stroke volume, dilates the pupils, and constricts arterioles in the skin and gut while dilating arterioles in leg muscles. It elevates the blood sugar level by increasing catalysis of glycogen to glucose in the liver, and at the same time begins the breakdown of lipids in fat cells. Like some other stress hormones, Adrenaline has a suppressive effect on the immune system
when a person gets nervous his fight or flight response takes over and cause addrenaline( word might be misspelled) to inrease which in return causes your body to act and your heart to beat faster so you can be more prepared to fight or fly.
It has a lot to do with the rise in adrenaline and the Fight, or Flight reaction to what your mind perceives as danger. That is what your body thinks is happening when you are nervous.
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Answer:
Adrenaline is released.
Adrenaline is a "fight or flight" hormone which is released from the adrenal glands whenever danger threatens. When secreted it floods out the endocrine gland into the bloodstream to instantly prepare the body for action in emergency situations. The hormone boosts the supply of oxygen and energy-giving glucose to the muscles making the individual more mentally alert and physically strong; only vital bodily processes occur.
Adrenaline plays a central role in the short-term stress reaction—the physiological response to threatening, exciting, or environmental stressor conditions such as high noise levels or bright light (see Fight-or-flight response). It is secreted by the adrenal medulla. When released into the bloodstream, Adrenaline binds to multiple receptors and has numerous effects throughout the body. It increases heart rate and stroke volume, dilates the pupils, and constricts arterioles in the skin and gut while dilating arterioles in leg muscles. It elevates the blood sugar level by increasing catalysis of glycogen to glucose in the liver, and at the same time begins the breakdown of lipids in fat cells. Like some other stress hormones, Adrenaline has a suppressive effect on the immune system
when a person gets nervous his fight or flight response takes over and cause addrenaline( word might be misspelled) to inrease which in return causes your body to act and your heart to beat faster so you can be more prepared to fight or fly.
It has a lot to do with the rise in adrenaline and the Fight, or Flight reaction to what your mind perceives as danger. That is what your body thinks is happening when you are nervous.
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