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A stroke is a sudden disruption in blood flow to the brain caused by a blockage of a blood vessel (ischemic stroke) or bleeding of

The vagina is part of the female reproductive tract. It extends from the uterus to outside the body. The opening to the vagina is

White blood cells protect the body against infection. Types of white blood cells include neutrophils, banded neutrophils

The spleen is an organ in the upper left side of the abdomen. It filters the blood by removing old or damaged blood cells and

The testicles (or testes) are the male sex organs that make sperm and the hormone testosterone. The two testicles are located in

Hemoglobin is the substance in red blood cells that carries oxygen. Oxygen from the lungs binds to hemoglobin molecules and is

The duodenum, or the first part of the small intestine, connects to the stomach. The duodenum is about 10 in. (25 cm) long and

Lymph nodes are part of the lymph system, which carries lymph fluid, nutrients, and waste material between the body tissues and

The breastbone, also called the sternum, is a long, flat bone in the center of the chest. It is connected to the ribs with

The optic nerve carries electrical impulses from the eye to the brain, which converts the impulses into the things that you see.