Breaks down the food we eat into smaller parts like sugars, proteins, and fats.

Takes in nutrients from food into the body through the small intestine.

Works with the circulatory system, The nutrients go into the blood and get carried to the rest of the body.

Moves blood all around the body to carry oxygen, food, and hormones.

Takes away waste like carbon dioxide from the cells.

Works with the respiratory system: Blood picks up oxygen from the lungs and drops off carbon dioxide to be breathed out.

Brings oxygen into your body when you breathe in.

Gets rid of carbon dioxide when you breathe out.

Works with the circulatory system: Blood carries the oxygen from the lungs to the body and brings carbon dioxide back to the lungs.

Makes hormones that control things like growth, energy, and mood.

Helps with long-term changes like puberty.

Works with the nervous system: The brain tells glands when to release hormones.

Your bones and muscles help you stand, move, and stay upright.

Protects important organs like your heart and brain.

Works with the nervous system: Nerves send messages to your muscles to help you move.

Sends messages between the brain and body.

Helps you think, feel, and react quickly.

Works with the musculoskeletal system: It tells your muscles when and how to move.

Makes sperm (in boys) and eggs (in girls).

Helps humans have babies.

Works with the endocrine system: Hormones like estrogen and testosterone control how the reproductive organs grow and work.