Arteries carry blood away from the heart. Pulmonary arteries transport blood that has a low oxygen content from the right ventricle to the lungs. Systemic arteries transport oxygenated blood from the left ventricle to the body tissues.Blood is pumped from the ventricles into large elastic arteries that branch repeatedly into smaller and smaller arteries until the branching results in microscopic arteries called arterioles.ystemic arteries transport oxygenated blood from the left ventricle to the body tissues. Blood is pumped from the ventricles into large elastic arteries that branch repeatedly into smaller and smaller arteries until the branching results in microscopic arteries called arterioles.
(concentric action) the 'true' form of contraction of a muscle in which it shortens against a load (which may be only that of gravity on the relevant body part), and so does positive work. Hence concentric exercise: that in which the principal agonists act concentrically. See also muscle contraction.
Full Definition of CONTRACTION. 1. a: the action or process of contracting: the state of being contracted b: the shortening and thickening of a functioning muscle or muscle fiber c: a reduction in business activity or growth. the act or process of making something smaller or of becoming smaller. medical: a movement of a muscle that causes it to become tight and that is sometimes painful; especially: a movement of muscles in the womb when a woman is giving birth to a child.