Artery – definition and function

Artery definition Artery is a flexible, muscular BLOOD vessel that carries blood from the HEART and oxygenated blood to tissues throughout the body. The wall of an artery has three layers: adventitia, the outermost layer, which is primarily connective tissue that gives the artery its FLEXIBILITY media, the middle layer, which is mostly smooth MUSCLEtissue that gives the artery the ability […]

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Sinoatrial (SA) node definition

What is Sinoatrial (SA) Node and Definition Sinoatrial node is a small cluster of specialized NERVE and MUSCLE fibers located in the upper wall of the heart’s right atrium. The SA node initiates the electrical pacing impulse that causes the HEART to contract. In the healthy heart the electrical impulse spreads in an orderly and […]

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