Homeostasis can be influenced by either internal or existing conditions (instrinsic factors) or external or environmental conditions ( extrinsic factors) and is maintained by many different mechanisms. The hypothalamus is involved in the regulation of body temperature, heart rate, blood pressure, and circadian rhythms (which include wake/sleep cycles). The kidneys are responsible for regulating blood water levels, re-absorption of substances into the blood, maintenance of salt and ion levels in the blood, regulation of blood pH, and excretion of urea and other waste products. The liver also helps to regulate lipid metabolism and is the primary site of cholesterol production. The liver is responsible for metabolizing toxic substances and with signaling from the pancreas maintains carbohydrate metabolism. The liver, the pancreas, the kidneys, and the brain (hypothalamus, the autonomic nervous system and the endocrine system) help maintain homeostasis. Homeostasis refers to the body’s ability to physiologically regulate its inner environment to ensure its stability in response to fluctuations in external or internal conditions. 8.1 The Concept of Homeostasis 8.2 Disease as a Homeostatic Imbalance 8.3 Measuring Homeostasis to Evaluate Health 8.4 Solubility 8.5 Solution Concentration 8.5.1 Molarity 8.5.2 Parts Per Solutions 8.5.3 Equivalents 8.6 Dilutions 8.7 Ion Concentrations in Solution 8.8 Movement of Molecules Across the Membrane 8.9 Summary 8.10 References For referencing this work, please click here. This text is published under creative commons licensing. Chapter 8: Homeostasis and Cellular Function
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