Begins when the heart is stimulated by an electrical

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returns the blood to the heart through patent veins. Begins when the heart is stimulated by an electrical impulse that originates in the SA node(sinoatrial) and travels to the AV node(atrioventicular) Cardiac output-is the amount of blood pumped by the heart each minute Is an outcome of coordinated effects of electrical and mechanical factors that move blood through the heart into the peripheral vascular vessels. Systole- The phase of the cardiac cycle during which the ventricles contract As the ventricles contract, they create pressure that closes the mitral and tricuspid valves, preventing backflow of blood into the atria. Diastole- The phase of the cardiac cycle when ventricles fill with blood Normal Cardiac output-4 to 6 L/min Tissue perfusion-the volume of blood that flows through target tissues. Supplied by blood flowing from arteries to capillaries maintains BP by constricting or dilating in response to stimuli
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Age-Related Differences Infants larger heart, and the heart occupies a larger space within the mediastinum. Systemic BP is low why? The weaker left ventricle of the neonate The left side of the heart develops strength and the systolic pressure rises rather sharply during the first 6 weeks.
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  • Fall '17
  • central perfusion

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