Medulla
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  Medulla



Medulla

   The inner part of an organ. The adrenal medulla is the center of the adrenal gland where epinephrine (adrenaline) is produced.

RELATED TERMS
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Organ
A structural unit of an animal or plant that serves a specific function.

Medulla
The inner part of an organ. The adrenal medulla is the center of the adrenal gland where epinephrine (adrenaline) is produced.

Gland
An organ that releases a chemical. Endocrine glands are ductless and secrete hormones directly into the bloodstream. Exocrine glands secrete externally, either through a tube or duct.

Epinephrine
One of two chemicals (the other is norepinephrine) released by the adrenal gland that increases the speed and force of heart beats. It dilates the airways to improve breathing and narrows blood vessels in the skin and intestine so that an increased flow of blood reaches the muscles and allows them to cope with the demands of exercise.



SIMILAR TERMS
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Medulla oblongata
The part of the brain just above the spinal cord that includes the control centers for breathing, circulation and heartbeat.



PREVIOUS AND NEXT TERMS
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Mastoid
A bony, rounded projection of the skull located behind each ear.

Mastoiditis
An infection of the mastoid bone that can cause redness, warmth, swelling and pain behind the ear, sometimes with drainage from the ear.

Maxillae
The pair of bones forming the upper jaw.

Median nerve
The nerve that stimulates some of the muscles of the hand and wrist.

Mediastinum
The tissues and organs located directly behind the sternum between the lungs. Contains the heart and its large vessels, the esophagus, thymus, lymph nodes and other structures and tissues.

Medulla

Medulla oblongata
The part of the brain just above the spinal cord that includes the control centers for breathing, circulation and heartbeat.

Melancholia
A mental state characterized by extreme sadness. A severe form of depression.

Meningioma
Tumor of the meninges, usually benign and slow-growing.

Menorrhagia
Heavy bleeding during menstruation.

Metacarpal
Any of the five bones that make up the hand and join the wrist to the fingers.

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