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Homeostasis

Homeostasis. Glossary. Maintain – keep up. Constant – the same. Internal – inside the body. Environment – surroundings of the body. What is Homeostasis?.

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Homeostasis

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  1. Homeostasis

  2. Glossary • Maintain – keep up. • Constant – the same. • Internal – inside the body. • Environment – surroundings of the body.

  3. What is Homeostasis? • Homeostasis - the ability of the body of an organism or cell to maintain stable internal conditions even when the outside environment changes continuously.

  4. Homeostatic control involves 3 components • Receptor – sensor, responds to changes and sends information to  • Control center – determines the set point, the point at which the variable is to be maintained. • Effector – output, sends the response to the stimulus.

  5. For example

  6. Video Time • http://www.mhhe.com/biosci/bio_animations/MH11%20Homeostasis_Web/index.html

  7. Video: Eye Pupil Reflex • https://www.youtube.com/watch?v=Yj5-cJgVX3c

  8. Homeostasis is maintained through 2 mechanisms: 1) Negative Feedback - (most common) 2) Positive Feedback

  9. Homework • Answer all 10 problems • State whether positive or negative and why

  10. What is the difference between positive feedback and negative feedback mechanisms?

  11. i Insulin Binds to glucose And transports it Into the cells

  12. What is Diabetes? Why does a high concentration of glucose in the bloodstream cause excessive urination and thirst?

  13. What is a system? • System – a group of bodily organs that function together to maintain homeostasis and thus, the survival of the organism.

  14. Biological Levels of Organization

  15. Organelles • Small cellular structures that perform metabolic functions for the cell.

  16. Cell • Most basic unit of all living things

  17. Tissue • A group of similar cells that performs a specific function.

  18. Organ • Formed of two or more tissues and carries out a specific function.

  19. Organ Systems • A group of organs that work together to perform a vital body function • E.g., the nervous system.

  20. Systems Can’t Work Alone

  21. Video • https://www.youtube.com/watch?v=ZRFykdf4kDc

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