Introduction to Body Systems

Humans are organisms.

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• Humans are living things.

• Humans have a life cycle:

  • Be Born, Grow, Reproduce, Die

• Humans have needs:

  • Food, Water, Shelter, Air​

• Humans are made of parts that work together to help us meet our needs.

• Each body part has a different functions.

Humans are made of cells.

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• Like all organisms, humans are made of cells. Examples of cells include blood cells, heart cells, and brain cells.

• A group of cells is called a tissue. Tissues include muscles, nerves, and the skin.

• A group of tissues is called an organ. Examples of organs include the heart, lungs, and brain.

• A group of organs is called an organ system. Organ systems include the nervous system, digestive system, and skeletal system.

• A group of organ systems is called an organism.

System Overview

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• We will discuss 7 systems:

• Circulatory System - carries blood around the body

• Respiratory System - absorbs oxygen and releases carbon dioxide

• Digestive System - turns food into fuel

• Skeletal System - gives the body a shape

• Muscular System - lets the body move

• Nervous System - transfers messages to and from the brain

• Reproductive System - creates new organisms