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Glossary

Glossary. Maintain – keep up. Constant – the same. Internal – inside the body. Environment – surroundings of the body Negative – something is lost or decreased... Does NOT mean bad. Homeostasis. The maintenance of a constant environment in the body

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Glossary

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  1. Glossary • Maintain – keep up. • Constant – the same. • Internal – inside the body. • Environment – surroundings of the body • Negative – something is lost or decreased... Does NOT mean bad

  2. Homeostasis The maintenance of a constant environment in the body (This happens despite constant changes in the surrounding environment)

  3. Why do we need it? • Body cells work best if they have the correct • Temperature • Water levels • Glucose concentration • Your body has mechanisms to keep the cells in a constant environment.

  4. Key Points • Conditions are not identical all the time • The goal is to keep internal factors (temp, blood sugar, oxygen levels, etc) relatively constant

  5. Carotid Body Chemoreceptors

  6. Homeostatic Control • Variable – factor being regulated • Receptor- sensor that detects changes (aka stimuli); sends out info about the change to the control center (via afferent pathway) • Control center- analyzes data from receptors; determines the appropriate response and sends a message • Effector- response (output stimulus sent via efferent pathway) from the control center • Resulting feedback- to adjust the variable to normal levels

  7. Collaborative Activity • Think of a situation that uses a homeostatic control mechanism. This can be an example related to the body or not. • In groups identify the 5 parts of the homeostatic control mechanism and record them on your poster paper. • Be ready to discuss these!

  8. Negative vs. Positive Feedback • Negative feedback mechanism • result is to decrease the initial stimulus • Positive feedback mechanism (rare) • Result is to increase the initial stimulus

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