Human Body

Muscles are formed from tissues that contract and relax, which produces motion.

Skin holds your body parts in, has pores for sweat to escape, and is filled with nerves that help you sense temperature and feel the things around you.

Cells are the smallest units or parts of living things; they are the body's building blocks.

Kidneys are a pair of filters that clean your blood, taking liquid waste from your bloodstream and sending it down to your bladder.

Lungs take oxygen that your body needs from the air, put it in your blood, and send it out of your body.

Bones provide structure, protect organs, anchor muscles, and store calcium.

Organs are groups of tissues that work together to perform specific functions in the body.

The heart is a muscular organ that pumps blood throughout the body, supplying oxygen and nutrients.

The liver processes nutrients from the digestive system, detoxifies harmful substances, and produces bile.

Tissues are groups of similar cells that work together to perform a specific function.