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Isabella Taylor——Studied at the University of Amsterdam, Lives in Amsterdam, Netherlands.
As a specialist in neuroscience with a focus on the autonomic nervous system, I can explain the role of the vagus nerve in regulating heart function.
The vagus nerve is a part of the parasympathetic nervous system, which is responsible for the body's rest and digest state. It plays a crucial role in regulating heart rate and heart function. The vagus nerve releases a neurotransmitter called acetylcholine, which binds to receptors on the heart muscle and results in the slowing of the heart rate and a decrease in cardiac contractility.
When the body is at rest or in a relaxed state, the vagus nerve is more active, leading to a slower heart rate. Conversely, during periods of stress or physical exertion, the sympathetic nervous system becomes more active, which can counteract the effects of the vagus nerve and increase the heart rate.
Moreover, the vagus nerve also influences the heart's ability to respond to changes in the body's demand for oxygen. It helps to modulate heart rate variability (HRV), which is the variation in time between each heartbeat. Higher HRV is generally associated with better cardiovascular health and resilience to stress.
In summary, the vagus nerve is a key player in maintaining a balanced heart rate and overall cardiovascular health through its influence on heart rate, cardiac contractility, and heart rate variability.
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Harper Davis——Studied at the University of Oxford, Lives in Oxford, UK.
Parasympathetic innervation of the heart is mediated by the vagus nerve. Specifically, the vagus nerve acts to lower the heart rate. The right vagus innervates the sinoatrial node. Parasympathetic hyperstimulation predisposes those affected to bradyarrhythmias.read more >>
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