1. Do Now: Good afternoon! Baby pictures are due tomorrow for extra credit!

2. What are the differences between your baby picture and you today
What are the differences between your baby picture and you today? Baby to Teen

4. Our cells are growing and getting bigger. OR We get more cells.
Why do we get bigger?
Our cells are growing and getting bigger. OR
We get more cells.

5. Field Mouse epithelial cells (100x)
African Elephant epithelial cells (100x)

6. Human epithelial cells (100x)
Frog epithelial cells (100x)

7. Human epithelial cells across time (infant, teenager, adult)
Adult Age 38
Baby Age 2
Teenager Age 14

8. Is growth a result of the increase of cells or are they getting bigger over time? Write that response for the last question on your sheet after discussing the different epithelial cells.

9. What does this statement from the cell theory mean
What does this statement from the cell theory mean? All cells come from preexisting cells.

11. From birth through adulthood, new cells are constantly forming;
that's how our bodies grow larger
Cells “grow” not by getting bigger, but by dividing in two. ...
They divide only to replace cells that have died or been damaged (Growth and Repair)   

12. Longest living cells- ones that last a lifetime
* Neurons of the cerebral cortex- Brain cells
* Cells of the eye’s inner lens
* Muscle cells of the heart
These cells never divide at all
Every cell has been produced since the birth time

13. Cells lining the stomach/colon (7 days)
Shortest living cells
White blood cells- helping the body fight infection only last a few hours-less than a day
Cells lining the stomach/colon (7 days)
Skin cells – cuts about days

14. Red blood cells (erythrocytes): 120 days * Platelets: 10 days
* Neutrophils (a type of white blood cell): 10 days
Fat cells (adipose cells): 8 years

15. The biological levels of organization of living things arranged from simplest to most complex:
organelle
cells
tissues
organs
organ systems

16. Reading_essentials mitosis.pdf
Go to Cell Growth and Reproduction ditto below
Reading_essentials mitosis.pdf