BIOL-242 Lecture Notes - Lecture 17: Vagus Nerve, Sympathetic Nervous System, Stroke Volume
12 May 2020
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Stroke volume (sv) : amount of blood pumped out through ventricles per minute. Also depends on venous return (how much blood is coming back into the right atrium). High venous return allows for the ventricle to be filled more completely, increasing the amount of blood ejected. Low venous return means low diastolic volume, low stroke volume. Bp = sv x hr x r. Blood pressure = stroke volume x heart rate x. If all three factors go , then bp will . Sinuses will detect the low blood pressure, and send only a few action potential signals to the brain to relay this information. The cardiac accellatory system will be activated and will send a few ap through the vagus nerve. As a result, the cardiac nerve/sympathetic nerve fibers sends many more action potential (ap) than parasympathetic (vagus). Sympathetic action potentials will prevail on nodes, releasing the neurotransmitter norepinephrine.
