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Lesson Overview

Lesson Overview. 7.4 Homeostasis and Cells. The Cell as an Organism. Multicellular and unicellular organisms must achieve homeostasis , relatively constant internal physical and chemical conditions. The Cell as an Organism.

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Lesson Overview

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  1. Lesson Overview 7.4 Homeostasis and Cells

  2. The Cell as an Organism • Multicellular and unicellular organisms must achieve homeostasis, relatively constant internal physical and chemical conditions.

  3. The Cell as an Organism • In terms of their numbers, unicellular organisms dominate life on Earth. • Unicellular organisms include both prokaryotes and eukaryotes.

  4. Multicellular Life • The cells of multicellular organisms are interdependent. • Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis.

  5. Levels of Organization • The specialized cells of multicellular organisms are organized into tissues, then into organs, and finally into organ systems.

  6. Cell Membrane Head Tail Carbohydrate chain Phospholipids Cholesterol Protein Channel

  7. Cellular Communication • Cells use chemical signals to control the rate of activity and action of the cell. • Allows the cell to hold together with other cells and send signals to one another.

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