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Anatomy: Fetus in Utero Amniotic sac. A thin-walled sac that surrounds the fetus during pregnancy. The sac is filled with liquid made by the fetus (amniotic fluid) and the membrane that covers the fetal side of the placenta (amnion). This protects the fetus from injury. It also

The Child's Immune System What is the immune system? The immune system protects your child's body from outside invaders. This includes germs, such as bacteria, viruses, and fungi, and toxins (chemicals made by microbes). The immune system is made up of different organs, cells

Reducing Your Health Risks with Vaccines Vaccines are one of the best ways to reduce your risk of certain major illnesses called infectious diseases. Avoiding certain infectious diseases or their complications will help to keep you healthier so you can continue be active in life

Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood

Anatomy and Function of the Urinary System How does the urinary system work? The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The kidney and

Cystic Fibrosis in Children Click on the links below to learn more about this topic. Cystic Fibrosis Overview Genetics of Cystic Fibrosis Cystic Fibrosis and the Respiratory System Cystic Fibrosis and the Digestive System Cystic Fibrosis and the Reproductive System Symptoms of

Endometrial Cancer: Diagnosis How is endometrial cancer diagnosed? If your healthcare provider thinks you might have endometrial cancer, usually because of abnormal vaginal bleeding, you'll need certain exams and tests to be sure. Endometrial cancer is cancer that starts in the

The Lungs in Pregnancy Respiratory system The respiratory system is made up of the organs involved in the exchange of oxygen and carbon dioxide. Its main job is to move fresh air (oxygen) into your body and move waste gases (carbon monoxide) out of your body. The system includes

Birth Injuries What is a birth injury? Sometimes during the birth process, the baby may suffer a physical injury that impairs function or structure of their body. This is sometimes called birth trauma or birth injury. It can happen during labor, delivery, or after delivery. Birth

Your Child's Allergies: Dust Mites What is a dust mite? Dust mites are microscopic organisms that live in homes and schools. They like warm, humid areas filled with dust. Dust mites feed on the shed scales of human skin that work their way into furniture, carpets, bedding, and