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Blood Pressure Homeostasis

Homeostasis in the ability of the body to keep an internal environment that is constant, regardless of outside influences. Blood pressure remains within normal limits through the utilization of both rapid and slow mechanisms. Working together, the mechanisms strive to maintain an approximate blood pressure of 120/80 mm Hg. The baroreceptor reflex is one of the most important fast acting homeostatic mechanisms involved in regulating blood pressure. This contains receptors, sensory nerves, and the medulla oblongata and motor nerves, all working together. Another rapid acting mechanism in the regulation of blood pressure is the secretion of epinephrine and norepinephrine by the adrenal gland. Baroreceptors, are found in certain places in the walls of the heart where they are able to sense any change in blood pressure. After the baroreceptor sence a change the sensory nerves are activated and send a message to the medulla oblongata, which is located in the brain. Depending on the signal received the medulla oblongata then decides whether to increase or decrease blood pressure. The motor nerves of the sympathetic and parasympathetic divisions of the autonomic nervous system are activated to carry out the adjustments needed to maintain blood pressure.
Sympathetic nervous system kicks in if the blood pressure is low and needs to increase. The nerves in the sympathetic nervous system supply an electrical system to the heart, and will increase the heart rate to contract more forcefully. The sympathetic nervous system also causes some blood vessels to constrict, which increases the resistance of the vessels. Together, these responses increase the amount of blood pumped by the heart each minute, which increases the blood pressure.

If blood pressure is too high and a decrease in blood pressure is needed, the parasympathetic nervous system

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