1. Take out your homework

2. 1) Given this setup, what would be the likely result given 30 min?
The setup below shows an osmometer. An osmometer is a device that measures osmotic pressure exerted by a liquid passing through a semipermeable membrane.
1) Given this setup, what would be the likely result given 30 min?

3. 2) What could account for the differences in lines A and B?
Here are ‘results’ from the setup. The graph shows one set of results (line B) compared to the results of a class combined (line A).
2) What could account for the differences in lines A and B?
3) How might results differ if the sucrose solution was 20% instead of 10%?

4. Obj 18-19
Questions?

5. Homeostasis “Constant internal environment”
How do unicellular organisms maintain homeostasis?
How might it be different for multicellular organisms?
What conditions are constant in you?
How are these maintained?

6. Cell Specialization
Multicellular organisms have specialized cells – cells with different roles
What are some examples?
Difference in organelles?
These cells contribute to homeostasis

7. Multicellularity Levels of organization in you?
Cell, Tissue, organ, system
Other examples

8. Levels of Organization
Tissue – group of cells that performs a particular function
What does smooth muscle do?

9. Organ – group of tissues working together that performs a particular function
What does the stomach do?
What other cells would be in the stomach?

10. System – group of organs working together that performs a particular function
What does the digestive system?
What other organs would be in the Dig. Sys?

11. Levels of Organization
What role does cell specialization play in ‘organization’?
Provide a different organ/system and describe what specializations a particular cell would have in that organ.
Why don’t unicellular organisms have these levels?
Relationship between size of organism and levels of organization?

12. Homework
THREE question YOU HAVE on the objectives