What are the differences between your baby picture and you today

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Presentation transcript:

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

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

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.

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

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

https://www.youtube.com/watch?v=P1h611sNji8

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)

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

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 14-27 days

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

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

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