If you continue to exercise, you may feel thirsty.
#LUMEN ANATOMY SKIN#
At the whole-body level, you notice some specific changes: your breathing and heart rate increase, your skin may flush, and you may sweat. Yet instead of these challenges damaging your body, our systems adapt to the situation. For example, consider what happens when you exercise, which can represent challenges to various body systems. We can consider the maintenance of homeostasis on a number of different levels. Any of these actions that help maintain the internal environment contribute to homeostasis. Your brain is constantly receiving information about the internal and external environment, and incorporating that information into responses that you may not even be aware of, such as slight changes in heart rate, breathing pattern, activity of certain muscle groups, eye movement, etc. But if you think about anatomy and physiology, even maintaining the body at rest requires a lot of internal activity. The root “stasis” of the term “homeostasis” may seem to imply that nothing is happening. Maintaining internal conditions in the body is called homeostasis(from homeo-, meaning similar, and stasis, meaning standing still). This ensures that the tissue will have enough oxygen to support its higher level of metabolism. For example, blood flow will increase to a tissue when that tissue becomes more active. But these changes actually contribute to keeping many of the body’s variables, and thus the body’s overall internal conditions, within relatively narrow ranges. Many aspects of the body are in a constant state of change-the volume and location of blood flow, the rate at which substances are exchanged between cells and the environment, and the rate at which cells are growing and dividing, are all examples. We will discuss homeostasis in every subsequent system. This section will review the terminology and explain the physiological mechanisms that are associated with homeostasis. Many medical conditions and diseases result from altered homeostasis. Multiple systems work together to help maintain the body’s temperature: we shiver, develop “goose bumps”, and blood flow to the skin, which causes heat loss to the environment, decreases. Homeostasis is the tendency of biological systems to maintain relatively constant conditions in the internal environment while continuously interacting with and adjusting to changes originating within or outside the system.Ĭonsider that when the outside temperature drops, the body does not just “equilibrate” with (become the same as) the environment.
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