1. How do cells work together?
Ch. 2 L. 2 Notes (pg. 42 – 45)

2. Directions: Write one interesting fact or one question in a complete sentence for each slide.

3. Vocabulary
Tissue - a group of the same kinds of cells working together doing the same job
Organ – a group of different tissues combined together in one structure

4. Types of Cells Your body has about 200 types of cells
A cell’s shape is specialized to fit its job
Cells have special structures to help with their work
Branching cells
Nerve and brain cells
Send signals quickly
Can connect several parts of the body at once
Flat cells
Found in skin, stomach, and mouth
Cover surfaces like shingles on a roof
Round Cells
Red blood cells
Carry oxygen all over the body
Shape helps move through vessels and pick up oxygen

5. Types of cells Hair-like structures Muscle fibers Many different jobs
Vibrate in your ear sending nerve signals to brain
Sweep dirt and germs out of airways and lungs
Muscle fibers
Made of protein
Are like threads that move to make the cell shorter
Work in bundles for strength

6. Cells form tissues Cells almost never work by themselves
Many of the same kind of cells make a tissue
Muscle cells make up muscle tissue
Bone cells make up bone tissue
Nerve cells make nerve tissue

7. Tissues form organs Organs are made up or many different tissues
Tissues work together to do a job in the body
Examples of organs:
Heart, lungs, eyes, ears, stomach
Skin is the largest organ of the body
Plant organs are stems, roots, leaves, and flowers

8. Skin cell tissue Skin protects the inside of the body
Keeps out germs and holds in water
Made up of many layers of skin cells
New cells are formed in bottom layers
New cells push old cells away from blood supply
By the time cells reach the surface they are dead and just fall off
Other tissues in the skin
Nerve cells for feeling
Muscle for moving hairs and other parts
Oil glands to keep skin soft

9. Skin cell tissue