8.4 Homeostasis and Cells

27.1 Organization of the Human Body

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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Multiple Choice

the roots of a plant help to anchor the plant to the soil, and are also used for food storage and water extraction.  Roots are made up of tissues, such as xylem, phloem, and pith.  In which level of organization would the roots of a plant most likely be classified?

• cell
• organ system
• tissue
• organ

​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

Multiple Choice

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

Multiple Choice

What does homeostasis mean?

• Temperature
• Water
• Cells
• Steady state

Multiple Choice

The maintenance of an organism’s internal environment is called:

• compensating

• homeostasis

• balancing

• routine

Multiple Choice

The maintenance of an organism’s internal environment is called:

• compensating

• homeostasis

• balancing

• routine