cell - the smallest unit that can live on its own and that makes up all living organisms; microscopic, tissue - a group of cells that possess a similar structure and perform a specific function, organ - a part of the body that is made up of cells and tissues that perform a specific function; heart, lungs, stomach, organ system - a group of organs that work together to perform one or more functions, circulatory system - supplies oxygen and nutrients to the whole body and removes waste through blood, digestive system - breaks down food and liquids into nutrients the body can use, endocrine system - a group of glands and organs that produce and release hormones into the bloodstream, immune system - cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases, integumentary system - the body's outer layer; protects the body from injury, infection, and the sun, and helps regulate body temperature, respiratory system - takes up oxygen from the air we breathe and removes the unwanted carbon dioxide; gas exchange, reproductive system - produces gametes (sperm and eggs) and supports the development of offspring, urinary system - filters the blood, removing waste and excess water as urine, skeletal system - gives the body its shape, protects organs, and allows for movement, muscular system - allows the body to move, maintain posture, and circulate blood, nervous system - a network of nerves and nerve cells that sends signals between the brain and the body,

7th Body Systems

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