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Blood Pressure - levels The appropriate amount of glucose...

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Blood Pressure Another great example of homeostasis and negative feedback is the maintenance of blood pressure. Special receptors in the heart, aorta and the internal carotid artery detect changes in blood pressure. Nerves carry this information to the brainstem . If the blood pressure is low, the brainstem sends information to the heart to speed up and to the blood vessels to constrict, thus increasing blood pressure throughout the body. If the blood pressure is too high, the brainstem sends signals to the heart to slow down and the blood vessels to dilate, lowering blood pressure. Failure to maintain proper blood pressure may result in damage to internal organs (high) or loss of consciousness (low). Blood Glucose A third example of homeostasis and negative feedback is the regulation of blood sugar
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Unformatted text preview: levels. The appropriate amount of glucose in the blood is between 90 and 110 mg/dl . At this level, the cells of the body receive enough glucose to perform their functions, but are not surrounded by so much that it begins to damage them. The amount of glucose in the blood is sensed by variety of cells. If the amount of glucose is too high, signals are sent to the pancreas to release the hormone insulin . Insulin tells the cells of the body to take up glucose and the liver cells to make glycogen . If glucose levels are low, the hormone glucagon is released. Glucagon talks to the liver to break down stored glycogen and release the resulting glucose into the blood; blood glucose levels rise. Figure 2...
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