30.1 Organization of the Human Body

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30.1 Organization of the Human Body

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30.1 Organization of the Human Body Lesson Overview 30.1 Organization of the Human Body

Organization of the Body The levels of organization in the body include: cells, tissues, organs, and organ systems.

Cell—the basic unit of structure and function in living things. Tissue—groups of cells with similar function that work together.

Epithelial tissue—lines the interior and exterior body surfaces (Examples: skin and lining of your stomach)

Connective tissue—provides support for the body and connects its parts (Examples: fat cells, bone cells, and blood cells)

Nervous tissue—transmits nerve impulses throughout the body by. Neurons: the cells that carry nerve impulses Glial cells: surround and protect neurons

Muscle tissue—creates body movements Voluntary muscles = movements you control (move your arms and legs) Involuntary muscles = movements you cannot control (muscles in digestive system or heart)

Organ— group of different types of tissues that work together to perform related functions (Example: the eye is an organ made up of epithelial tissue, nervous tissue, muscle tissue, and connective tissue)

Organ system–a group of organs that perform closely related functions (Example: brain and spinal cord are 2 organs of the nervous system). The organ systems interact to maintain homeostasis in the body as a whole.