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The lungs' airways (bronchial tubes) divide into smaller and smaller branches (bronchioles). The airways end in air sacs (alveoli)

The retinal pigment epithelium (RPE) is a layer of support cells that lines the back of the eye. It is normally attached to the

The esophagus is the tube that connects the throat to the stomach. When you eat or drink, food and liquids travel from your mouth

The female reproductive system produces hormones and makes it possible to get pregnant and give birth. It consists of two ovaries

In GERD, the valve at the top of the stomach (where the stomach and the esophagus connect) does not close tightly enough. This

An abdominal ultrasound takes pictures of the organs and other structures in your upper belly. It uses sound waves to show images

The esophagus connects to the stomach at an opening in the diaphragm called the hiatus. The lower esophageal sphincter (LES)

The lower digestive system includes the last part of the small intestine, the large intestine (ascending colon, transverse colon

The two ovaries are small glands that produce eggs and release hormones. Each ovary is attached to the uterus by a ligament. About

The prostate is part of the male reproductive system. It's a small, walnut-shaped organ that produces most of the fluid in semen