Levels of Organization

• Cell-Basic Unit of Life

• Tissue-Collection of same type of cells to perform a similar function

• Organ-Collection of different tissues that perform a specialized job (Heart, Lungs, Brain)

• Organ System-Collection of organs that work together to perform a specialized job (Digestive Tract, Nervous System)

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Tissues

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​Epithelial Tissue

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1. Support the body (bones/fat) and connect parts (tendons, skin and blood)

2. Provide support and adhesion in order to form organs.

3. Help connect the organs or diffuse nutrients and waste materials between the organs.

4. Provided with a large number of blood vessels for the transport of nutrients, oxygen, water, and waste materials.

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​Connective Tissue

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1. Support the body (bones/fat) and connect parts (tendons, cartilage and blood)

2. Provide support and adhesion in order to form organs.

3. Help connect the organs or diffuse nutrients and waste materials between the organs.

4. Provided with a large number of blood vessels for the transport of nutrients, oxygen, water, and waste materials.

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Homeostasis

• Body/cell's steady-state

• Comfort Zone (Normal Ranges)

• Control response to environment

• Control making/storing energy

• Control when cells reproduce

• Control growth and cell division