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Do Now. Regents Review Day 07. Homeostasis and Organ Systems. Homeostasis. Homeostasis is when the body stays healthy and balanced . A failure of homeostasis leads to disease. Regents Questions. Feedback mechanisms.

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  1. Do Now

  2. Regents Review Day 07 Homeostasis and Organ Systems

  3. Homeostasis • Homeostasis is when the body stays healthy and balanced. • A failure of homeostasis leads to disease.

  4. Regents Questions

  5. Feedback mechanisms • Feedback mechanisms keep the body healthy by responding to change and keeping things balanced. • Example – High blood sugar causes the release of insulin from the pancreas to lower the blood sugar back to normal.

  6. Regents Questions

  7. Organ Systems • The digestive system breaks food down into smaller molecules that can diffuse into the blood and fit into cells. • The circulatory systemtransports (carries) nutrients, oxygen, hormones, antibodies, and wastes throughout the body in the blood.

  8. Regents Questions

  9. Organ Systems • The excretory system removes nitrogenous cellular waste from the body. • The nervous and endocrine systems are responsible for cellular communication by using proteins and receptors.

  10. Regents Review

  11. Organ Systems • The respiratory system is responsible for gas exchange. • The immune system protects from disease: • Specific antibodies stick to the antigens on the surface (cell membrane) of specific pathogens (disease causing microbes) and mark them for destruction by white blood cells.

  12. Regents Questions

  13. Organ Systems • Allergies are an immune response to usually harmless substances. • AIDS makes people sick by destroying their immune system. • Vaccines expose people to weakened or dead pathogens so that the body creates antibodies and remembers the pathogen.

  14. Regents Questions

  15. Regents Questions

  16. Homework #40 R.B. p. 35-37, #16-17, 31-34 (full answers only)

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