Medical

Influenza is an infectious disease that birds and animals can get. The flu generally gives you a fever, sore throat, muscle pains, headache, a cough, and generally makes you feel very bad.

An injury is damage done to a living thing. Injuries can range from a small scratch or bruise to a broken bone.

Intestines are part of your digestive tract. They are basically a long tube that runs from your stomach to your anus. The picture is of some pig intestines for sale at a market.

An itch is an annoying, twingey feeling in your skin that you just have to scratch. Some itches are from touching something like poison ivy, some are from mosquito bites, and others just happen for no reason.

Your jaw is the bottom part of your face. Your jaw has a separate bone and can move while you keep the rest of your head still. The bones in the picture are a sheep's jawbone and skull.

Your kidney is an organ in your body that excretes urine.

Your knuckles are the joints on your hand that allow your fingers to bend around. Knuckles are quite hard and bony and stick out when you make a fist. When people get into fights they often hurt their knuckles.

Larynx is the technical word for the voice box in your throat. It is part of the air way, and it helps you make sounds when you talk or sing.

The larynx has vocal cords that vibrate when you breathe out. It also helps protect your windpipe by closing when you swallow. The larynx is found in the front of the neck, between the mouth and the trachea. In some people, it makes a visible bump called the Adam's apple.

The lens is a small clear part inside your eye. It helps your eye focus on things you are looking at.

The lens changes shape to focus light onto the retina, which sends signals to your brain.

lan Your lips are the pink or red areas around your mouth. You use your lips to talk and to kiss.