An adult human at rest takes appropriately 2,500 ml of fluid daily. The heart also plays a role in correcting overload imbalances, by releasing ANP from the right atrium. The RAA system controls fluid volume, in which when the blood volume decreases, blood flow to the renal juxtaglomerular apparatus is reduced, thereby activating the RAA system. ADH regulates the amount of water the kidney tubules absorb and is released in response to low blood volume or in response to an increase in concentration of sodium and other solutes in the intravascular fluids. The thirst center in the hypothalamus stimulates or inhibits the desire for a person to drink. Extracellular fluid mostly appears as interstitial tissue fluid and intravascular fluid. Intracellular fluid functions as a stabilizing agent for the parts of the cell, helps maintain cell shape, and assists with transport of nutrients across the cell membrane, in and out of the cell. Body fluids are divided between two main compartments: the intracellular fluid and the extracellular fluid compartments. The endocrine system uses the release and action of hormones to maintain homeostasis.įluids make up a large portion of the body, which is approximately 50%-60% of the total body weight. The nervous system regulates homeostasis by sensing system deviations and sending nerve impulses to appropriate organs. The major systems involved in feedback are the nervous and endocrine systems. ![]() ![]() Blood pressure control and maintenance of normal body temperature are examples of negative feedback while blood clotting after an injury and a woman in labor are examples of positive feedback. Positive feedback enhances or intensifies the original stimulus. Negative feedback occurs when the body reverses an original stimulus for the body to regain physiologic balance. Feedback is the relaying of information about a given condition to the appropriate organ or system.Homeostasis is the dynamic process in which the body maintains balance by constantly adjusting to internal and external stimuli.
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