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How do sympathetic and parasympathetic activity control heart rate during hypobaric hypoxic conditions What is the basic mechanism of action?
Wiki User
∙ 14y ago
Sympathetic activity during hypobaric hypoxic condition would increase while parasympathetic action would decrease. Parasympathetic activity via the vegus nerve would decrease its affects on the AV and SA nodes because of the increase in sympathetic activity. Cyclic AMP from the increase in sympathetic activity blocks Ach from binding muscarinic receptors on the nerves. This blocking of Ach would slow G protein from keeping leak K channels being open and for the G Protein to slow its closing of T-type Ca channels. Increase in sympathetic activity leads to norepinephrine and epinephrine being released. They bind to B1 receptors that activate Gs to activate Adenylate cyclase to activate cAMP that causes pro Kinase to open funny channles and t-type Ca channles causing depolerization.
Wiki User
∙ 14y ago
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Explain the difference between sympathetic and parasympathetic reactions as they occur in the autonomic nervous system?
The sympathetic nervous system is most active when you are in an emergency, exercising, or an exciting or embarrassing situation. It is often referred to as the "fight-or-flight" system. It increases the heart rate, blood pressure, and blood glucose levels. It also dilates the bronchioles of the lungs, and dilates the blood vessels of the skeletal muscles. This nervous system enables the body to cope rapidly with situations. The parasympathetic nervous system is active when the body is resting. It is referred to as the "resting-and-digesting" system. It conserves your body's energy by slowing the heart rate. It also promotes digestion.sypmathetic is the "fight or flight" response and the parasympathetic is the "rest and digest" responses
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