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Saphenous Vein
A vein located in the leg, that is commonly used as a conduit to perform coronary artery bypass grafts.

Sinus Node
Bundle of excitatory tissue found in the right atrium that functions as the pacemaker of the heart.

1. A blockage or narrowing in the lumen of a vessel, thereby compromising optimal flow of fluid or blood. 2. A narrowing or blockage of a coronary artery.

1. Relating to the sternum or breastbone. 2. Region between two mammary regions.

Brain injury caused by abrupt disruption of blood flow to the brain. Most frequently caused by arterial occlusion (due to thrombosis or embolism) or to intracranial hemorrhage (rupture of blood vessel or aneurysm).

Stroke volume
The amount of blood ejected by the ventricle during a ventricular contraction.

Beneath the skin.

Toward or on the surface of the body.

Above another structure.

Lying on the back.

Referring to the period of time during contraction of the ventricle(s).

Systolic Pressure
The arterial blood pressure during the systolic phase of the cardiac cycle.

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