sarcomere the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands, along the length of the myofibril that make up the myocardium of the heart.
smooth muscle cells cells that are predominant in the middle wall of arteries, the media; these cells migrate into the intima to strengthen the wall that is injured during the development of atheroma or following trauma from balloon angioplasty or intracoronary stenting. The strong smooth muscle cells are nature’s effective band-aid that help to fortify the damaged wall of arteries.
sodium cardiac channels cardiac cells possess channels through which sodium and potassium flow inward and outward; the exchange of positive and negative charge produces a small current.
stroke damage of part of the brain due to blockage or rupture of an artery in the brain, which leads to weakness or paralysis of limbs with or without disturbances of speech or conscious¬ness. A stroke or cerebrovascular accident is not a form of heart attack.
sudden cardiac death death from cardiac causes that occurs instantaneously or within the hour

supraventricular tachycardia tachycardia arising in the atrium,
that is above the ventricle. sympathomimetic impulses from the sympathetic nervous

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