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lhaksam lhaksam
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10 years ago
Hello,
Can some smart soul start me out in the right direction to answer this question!
Thank you in advance for your time

Methods of adjusting heart rate, etc.
temperature, hormones, nervous system, etc.  - how are these able to adjust the function of the heart?
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nite_n_daynite_n_day
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10 years ago
There are many hormones that affect heart rate. For example, epinephrine (adrenaline) increases the HEART BEAT RATE to face emergency situations. Epinephrine is a "fight or flight" hormone which is released from the adrenal glands when danger threatens or in an emergency. When secreted into the bloodstream, it rapidly prepares the body for action in emergency situations. The hormone boosts the supply of oxygen and glucose to the brain and muscles, while suppressing other non-emergency bodily processes (digestion in particular).

When released into the bloodstream, epinephrine 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, epinephrine has a suppressive effect on the immune system.
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lhaksam Author
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#3
10 years ago
Thank you for this detailed answer- most appreciated!
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