Nervous System

Controls movement, senses, breathing, and thought. Acts as the body's command center

Endocrine System

Releases hormones to regulate growth, metabolism, and stress response. Works slowly but affects long-term processes

Respiratory System

Delivers oxygen and removes carbon dioxide

Digestive System

Breaks down food and absorbs nutrients

Circulatory System

Moves oxygen, nutrients, and waste throughout the body

Urinary System

Filters waste from the blood and produces urine

Skeletal System

Provides support, protects organs, and produces blood cells

Muscular System

Works with bones to allow movement and generate heat

Immune System

Skin, hair, and nails form a barrier against germs

Genital System

Enables reproduction and passes on genetic material