Medical

Your bellybutton, or navel, is the little dent in the middle of your tummy. When you were born, there was a cord connecting your belly button to your mother.

Bile is a yellowish fluid made by the liver in the body. It helps your body digest food.

Bile is stored in the gallbladder and released into the small intestine, especially after you eat. It helps break down fats so your body can absorb them.

A blaze is either a brightly burning fire, or the white mark down the middle of a horse's face.

A person or animal is blind if they cannot see. People who are blind can still live very full lives. They can read books written in braille and can travel around with the help of a white cane or a seeing eye dog.

Blood is a red liquid that your heart pumps through your entire body. Blood carries all the nutrients that your body needs to live and grow. Normally you can never see your blood as it is inside you, but when you have an accident, cut yourself and bleed you can see your blood.

However, not all creatures have red blood. Some marine creatures such as horseshoe crabs and many insects have green blood, which contains the copper-based cyanoglobin rather than the red iron-based haemoglobin.

Your body is the entire set of physical parts of a person or an animal. It includes your head, arms, legs, and all of your internal organs.

Your body is what you use to move around and interact with the world.

Your brain is inside your head, protected by your skull. All creatures that have a skeleton have a brain inside their head. Your brain controls everything that goes on inside your body, like your breathing, digestion and heartbeat. Your brain is what controls how you move your arms and legs to move, and controls talking and thinking.

You breathe when you draw air into your lungs through your nose or mouth, and then back out again. Breathing in is inhaling and breathing out is exhaling.

When you fall and hurt yourself or hit yourself hard on something else, you often get a dark purple or blue bruise. A bruise happens when the blood vessels under your skin get broken and you bleed under your skin. Bruises can take several days to go away.

A cast is a hard shell usually made from plaster-soaked bandages. Casts are used to hold a broken bone in place while it heals.