Primarily muscle!: Obviously it is primarily the contraction of the left ventricle. In normal people, the amount of blood entering the heart during diastole, determines left ventricular filling pressure. In a normal, this should increase the force of ejection and improve ejection fraction. If the peripheral blood vessels (aterioles) are tightened you will need more cardiac work to pump blood. The dilemma of mbp!
Answered 12/9/2013
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