An ultrasound is a machine that uses sound waves to determine objects inside of the body.

Anaesthesia is a drug that patients receive when they get surgery. It makes them fall asleep and not feel any pain.

William T. G. Morton, an American dentist, created anaesthesia in 1846.

Anaesthesia is important for performing surgeries that wouldn't be possible without it.

An organ transplant is when an organ is removed from someone's body, and is replaced by an organ from someone else.

Dr Joseph Murphy and Dr David Hume, two American doctors, successfully performed the first kidney transplant in 1954.

Organ transplants are important for people that have failing organs.

Insulin is a hormone that helps regulate blood sugars.

Dr. Frederick Banting and Charles best, Canadian doctor and medical student, first successful used insulin to regulate hormones in 1921.

Today, insulin is important to people living with Diabetes.

A stethoscope is a tool that is used to listen to people's hearts.

Rene Laennec, a French doctor, first invented and used the stethoscope in the 1860s to listen to a woman's heart without putting his ear on her chest.

Stethoscopes are important for making sure people's hearts sound good.