1.3-- Homeostasis

Master homeostasis! Biology worksheet on internal balance, feedback loops, and examples.

What is Homeostasis? Sheldon explains homeostasis. How does Sheldon define homeostasis? Examples of Homeostasis Why is homeostasis important? Directions: Go to the following websites in order to fill in the blanks. Homeostasis is a big word that biologists use to indicate that an organism needs to keep conditions inside of itself the same,even though conditions outside are always changing.All of your body's systems work together maintain homeostasis inside of your body. Homeostasis is achieved by making sure the temperature,pH (acidity), and oxygenlevels (and many other factors) are set just right for your cells to survive. Homeostasis levels are different for each species.Negative feedbackis a process that happens when your systems need to slow down or completely stop a process that is happening. When you eat, food travels into your stomach, and digestion begins. You don't need your stomach working if you aren't eating.Another example of negative feedback occurs when your body's temperaturebegins to rise and a negative feedback response works to counteract and stop the rise in temperature. Sweating is a good example of negative feedback.Positive feedback is the opposite of negative feedback in that encourages a physiological process or amplifies the action of a system. Positive feedback is a cyclic process that can continue to amplify your body's response to a stimulus until a negative feedback response takes over.All sorts of factors affect the suitability of our body fluids to sustain life; these include properties like temperature, salinity,acidity (carbon dioxide), and the concentrations of nutrients and wastes (urea, glucose, various ion,oxygen).This control is achieved with various organs in the body.For example:Thermal regulation The skeletal muscles can shiver to produce heat if the body temperature is too low. Non-shivering thermogenesis involves the decomposition off at to produce heat. Sweating cools the body with the use of evaporation.Chemical regulation The pancreas produces insulinand glucagonto control blood-sugar concentration. The lungs take in oxygen and give off carbon dioxide. The kidneys remove urea, and adjust the concentrations of water and a wide variety of ions. _ is the optimal level for an organism that it constantly tries to maintain in the face of the ever changing environment. Thermoregulation Set point Homeostasis Induced fit model of interactional forces