1 Area - Fixed
2 Areas - Fixed
3 Areas - Fixed
A vaccine is a biological substance designed to protect humans from infections caused by bacteria and viruses. Vaccines are also called immunizations because they take advantage of our natural immune systems ability to prevent infectious illness. To understand how vaccines work, we need to consider how our immune system protects us from infections.
An ultrasound also called a sonogram helps your doctor find out whether the fetus is developing normally. Your doctor might recommend that you have 1 or more ultrasounds at different points in your pregnancy. It can be used to check the anatomy of the fetus for defects or problems.
X-rays are a type of radiation called electromagnetic waves. X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Calcium in bones absorbs x-rays the most, so bones look white. Fat and other soft tissues absorb less and look gray. Air absorbs the least, so lungs look black.