Topics
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Autonomic and Reflexive Control of Circulation
Overview of autonomic control The afferent nerves are shared by both the sympathetic and parasympathetic branches of the autonomic nervous system; the glossopharyngeal (CN IX) and vagal (CN X) nerves receive information from baroreceptors, chemoreceptors, and cardiopulmonary receptors regarding blood pressure. These afferent nerves both communicate to a central area – the nucleus tractus solitarius…
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Circulation
The two circulations in the body are the pulmonary and systemic circulations. The right side of the heart delivers blood to the pulmonary circulation, to partake in gas exchange. The left side of the heart delivers oxygenated blood onto the rest of the body. The human body has approximately 65-75ml/kg of blood, depending on whether…
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Cardiac Output
We return to the equation that we started with in the beginning of this series, to examine the first determinant of MAP: cardiac output. MAP = CO x SVR Cardiac output (CO) is the amount of blood pumped out of the heart per unit of time. This is calculated by multiplying the stroke volume by the heart rate,…