Systems

The circulatory system transports oxygen, nutrients, hormones, and waste products around the body using the heart, blood vessels, and blood.

The digestive system breaks down food into small molecules that can be absorbed into the blood and used by the body's cells.

Your immune system is your body's defence network against disease. It recognises harmful invaders like bacteria and viruses, attacks them, and remembers how to fight them quickly if they return.

The muscular system consists of over 600 muscles that produce movement, maintain posture, and generate body heat.

The nervous system detects stimuli, processes information, and coordinates responses, allowing the body to react to internal and external changes.

The respiratory system brings oxygen into the body and removes carbon dioxide, enabling cells to release energy through aerobic respiration.

The skeletal system is the framework of bones that supports the body, protects organs, enables movement, and produces blood cells.

Skin is the largest organ in your body. It protects you from the environment, regulates body temperature, allows you to sense touch and pain, and helps prevent infection.