Cell Theory and Levels of Organization

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What is Cell Theory?

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Cell Theory is a fundamental concept in biology that states: 1) All living things are made up of cells, 2) Cells are the basic unit of life, and 3) All cells come from pre-existing cells.

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NGSS.MS-LS1-1

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What is a tissue?

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A tissue is a group of the same type of cells that work together to perform a specific function.

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NGSS.MS-LS1-3

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What is an organ?

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An organ is a structure made up of different types of tissues that work together to perform a specific function.

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What is an organ system?

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An organ system is a group of organs that work together to perform complex functions necessary for life.

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What is the smallest unit of life?

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The smallest unit of life is a cell.

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

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What do all cells come from?

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All cells come from pre-existing cells.

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What is homeostasis?

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Homeostasis is the ability of a cell or organism to maintain a stable internal environment despite changes in external conditions.

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NGSS.HS-LS1-3

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What is the function of nutrients in cells?

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Nutrients provide the energy and materials needed for cells to grow, repair, and maintain their functions.

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NGSS.MS-LS1-2

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What is the role of waste excretion in cells?

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Waste excretion is the process by which cells remove harmful substances and byproducts of metabolism to maintain health.

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What is the relationship between tissues and organs?

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Tissues combine to form organs, which perform specific functions in the body.