Homeostasis (Unit 1)

Learn about homeostasis and how organisms maintain a stable internal environment! Practice identifying examples and feedback loops.

What is the purpose of homeostasis in living organisms? Pick the best possible answer. To create responses in the body To get of responses in the body To maintain certain levels in the body To organize the body into systems Which of the following would be an example of homeostasis? A bird flies away when they see a predator nearby A bacteria is a type of prokaryotic cell Heterotrophs are organisms that obtain energy from eating other organisms To decrease body temperature (via perspiration) when body temperature rises from normal levels SOL Practice: The concentration of glucose must be maintained within a fairly narrow range in most vertebrates. This statement is an example of — excretion fermentation glycolysis homeostasis In humans, many of the chemical reactions that occur to maintain homeostasis uses _ feedback. (Hint: think of what happens when body temperature increases. What happens next?) Positive Negative Neutral Match the description to its term: Homeostasis the tendency to maintain a balanced environmental condition in the body Response = Organism perspires after body temperature rises Homeostasis occurs = to lower body temperature to maintain body temperature at a certain degree Response = Organism increases their breathing rate during running of several miles Homeostasis occurs = cells need more oxygen during increased activity Response a reaction to changes in the environment Response = organism feels thirsty Homeostasis occurs = body does not have enough water so organism will want to drink more Stimulus (stimuli) a change in the environment Click on the blank space and choose the best term. All living organisms respond to changes in the environment. They must do this in order to maintain homeostasis, the process of maintaining a constant and balanced environment inside the body. For example, body temperature is maintained in the human body at around 98.7 degrees F. When the body temperature increases above its normal range, we will perspire (sweating) to try to cool and bring down the body temperature. When the body temperature decreases below its normal range, we will shiver so the muscles create heat to try to warm and bring up the body temperature.