ECG See electrocardiography.

echocardiography An ultrasound examination of the heart. The information recorded during the procedure is called an echocardiogram.

eczema, atopic A recurrent, inflammatory skin condition that produces redness, itch- 457

ing, and scaly patches. Atopic eczema tends to run in families. Gl°ssary edema Abnormal accumulation of fluid in the body tissues.

EEG See electroencephalography.

ejaculation Discharge of semen from the penis during orgasm.

electrocardiography A procedure used to examine the electrical activity of the heart. The information recorded during the procedure is called an electrocardiogram.

electrocochleography A hearing test that measures the sensitivity of the sensory hair cells in the inner ear in response to sound waves. The graphic record of the test is called an electrocochleogram.

electroencephalography An examination of the electrical activity of the brain. The information recorded during the procedure is called an electroencephalogram.

electrolytes Sodium, potassium, and other essential minerals that are involved in regulating various body processes.

embolism Interruption of blood flow in a blood vessel by an embolus.

embolus A plug of material (such as a blood clot or an air bubble) that can travel in the bloodstream and block a blood vessel.

enamel The hard, thin covering of a tooth (see crown, natural).

encephalitis Inflammation of the brain, often caused by a viral infection.

endocrine system A network of glands, organs, and tissues that produce and secrete hormones directly into the bloodstream to regulate many essential body processes.

endocrine therapy See hormone therapy.

endorphins Chemicals in the brain that can improve mood and help control a person's response to pain and stress.

endoscopic retrograde cholangiopancreatography An X-ray examination of the gallbladder, bile ducts, and pancreas using endoscopy and a contrast medium.

endoscopy A procedure that uses a lighted viewing instrument called an endoscope to look inside a body cavity or organ to diagnose or treat disorders.

enzyme A protein that controls chemical reactions in the body.

epicondylitis Inflammation of the tendons that attach the forearm muscles to the elbow, usually caused by repetitive movement of the forearm. Golfer's elbow and tennis elbow are two types of epicondylitis.

458 epidermis The thin outer layer of skin, made up of dead cells and keratin, which

Glossary forms a protective covering. The epidermis also contains special cells that produce melanin.

epididymis A long, coiled tube at the back of each testicle that collects sperm and stores them until they mature.

epididymitis Inflammation of the epididymis caused by bacteria that are normally found in the intestine or by Chlamydia trachomatis.

epilepsy A condition characterized by recurrent seizures caused by abnormal electrical activity in the brain.

epinephrine Also known as adrenaline. A hormone produced by the adrenal glands that increases heart rate and blood flow and improves breathing.

Epstein-Barr virus A herpesvirus that causes mononucleosis.

ERCP See endoscopic retrograde cholangiopancreatography.

erectile dysfunction Also known as impotence. The persistent inability to achieve and maintain an erection sufficient to complete sexual intercourse.

essential hypertension See primary hypertension.

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