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.

6. For example

7. Video Time

8. Video: Eye Pupil Reflex

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

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

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

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

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

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

20. Biological Levels of Organization

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

22. Cell
Most basic unit of all living things

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

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

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

26. Systems Can’t Work Alone

27. Video