Medical

Pregnancy is the state female mammals are in when they have one or more babies growing inside them, in their uterus. People, cows and horses usually have one baby at a time, while animals like pigs and cats have many babies at a time.

The radius is one of the bones in your arm. It is found in the lower arm, between the elbow and the wrist.

The radius helps you move and rotate your hand. When you turn your palm up or down, the radius and the ulna work together.

Your rectum is the last section of the large intestine in humans.

The rectum stores solid waste before it leaves the body. Waste moves from the colon into the rectum, then leaves through the anus during a bowel movement.

The retina is a thin layer of tissue at the back of the eye. It helps you see by turning light into signals that go into your brain.

The retina is connected to the brain through the optic nerve. When light enters your eye, the retina receives it and sends images as electrical signals. You can find the retina lining the inside surface at the back of each eye.

Your ribs are the bones that make the shape of your chest and torso. You can see the ribs clearly on a person or animal that is underweight.

An animal's rump is its fleshy hindquarters, bottom or buttocks. A cut of meat taken from an animal's rump may have the same name, for example rump steak.

A scab is a hard layer that forms over an injury, as part of the healing process. After a few days, the scab falls off and eventually a scar will be all that remains of the injury.

Your scalp is the skin on top of your head, where you normally grow hair. When men go bald you can easily see their scalp. The man in the photo has his scalp showing through a scar.

A scar is a mark on your skin that shows where it has healed after it was damaged. Scar tissue can also form inside you if you have an internal injury. The man in the picture has a scar from donating a kidney.

Something has a sedative effect if it makes you calm and sleepy. Many things have a sedative effect. Some are pills, some are herbs like valerian, and some kinds of music also have a sedative effect.