1. Levels of
Organization

2. Cell Specialization
Zygote: fertilized cell created by the union of the egg and sperm
Embryonic stem cells
Created during earliest divisions
Potential to become any type of cell
Average human:
100 trillion cells
Over 200 types of human cells

3. Determination Determination
Stem cell genes program the cell to be a specific type
Few weeks into development
Irreversible

4. Stem cell programmed to become a muscle cellON ON ON
Genes (switches) exist in both cells, but are activated in one type and deactivated in the other.
Stem cell programmed to become a nerve cell ON ON ON

5. Differentiation Differentiation
Cells acquire the structures & functions of a specialized cell

7. Programmed cell death (apoptosis) between the fingers

8. Webbed Toes

9. Organization Cell: Basic unit Tissue: Group of cells 4 types
Organ: Groups of tissue
Ex: lung contains each tissue
Organ System: Group of organs working together
Digestive System
Organism: all organ systems working together

10. Body Tissues
Muscle: contracting cells
Skeletal, cardiac cells

11. Body Tissues
Connective Tissue: Support the body
Bone, fat, tendons

12. Body Tissues Epithelial: protection sheet of cells
skin, stomach lining

13. Body Tissues Nerve Tissue: Transmit electric signals
Brain & Spinal Cord

14. Kobe Kuiz What is a zygote?
What is the specific function of a stem cell?
How does “determination” differ from “differentiation”?
Cells are programmed to die during a process called ______.
From smallest to largest, name the 5 levels of organization.
Name the four types of tissues.
Which tissue is able to stretch and contract?
Which tissue transmits electric signals?
Which tissue covers and protects the body?
Which tissue connects the body?