Circulatory Function

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The circulatory system

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consists of the heart which pumps blood to the tissues the venous system which collects deowygenated blood from the tissues and returns it to the heart and the capillaries, where exchange of gases, nutrients, and wastes takes place

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The circulatory system can be divided into two parts 1. is the pulmonary

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The pulmonary circulation which moves blood through the lungs and creates a link with the gas exchange function of the respiratory system

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Systemic circulation is the second part of the circulatory system

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moves blood throughout all the other tissues of the body

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The right side of the heart is the

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pulmonary arteries, the pumonary capillaries and the pulmonary veins

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What is the only artery that carries deoxgenated venous blood?

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the pulmonary artery

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What is the only vein tha caries oxygenated arterial blood?

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the pulmonary vein

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Name the two parts of the circulatory system

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the low pressure pulmonary circulation, linking circulation and gas exchange in the lungs and the high pressure systemic circulation providing oxygen and nutrients to the tissues

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The circulation is a closed system

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so the output of the right and left heart must be equal over time for effective functioning of the circulation

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The right side of the heart pumps?

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blood to the lungs

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the left side of the heart pumps?

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blood to the systemic circulation

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The circulatory system functions as a

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transport system that circulates nutrients and other materials to the tissues and removes waste products.

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The heart pumps

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blood throughout the system and the blood vessels serve as tubes through which blood flows.

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the arterial system

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carries blood from the heart to the tissues and the veins carry it back to the heart.

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the systemic system is served by

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the left heart which provides fblood flow for all the tissues except the lungs

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the lungs are served by

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the right side of the heart and the pulmonary circulation. Blood moves throughout the circulation along a pressure gradient, moving from the high pressure arterial system t the low pressure venous system.

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hemodynamics refers to the

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the priniples that govern blood flow in the circulatory system.

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The most important factors governing the flow of blood in the circulatory system are

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pressure, resistance and flow

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peripheral vascular resistance or systemic vascular resistance

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the collective resistance of all the vessels in that part of the circulation

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The rate of blood flow is directly related

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to the pressure difference between the two ends of the vessel and the vessel radius and inversely related to vessel length and blood viscosity.

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Vessel radius

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In addition to pressure and resistance the rate of blood flow through a vessel is affected by the fourth power of its radius. (the radius multiplied by itself four times.) If the radius of 2 mm will be 16 times greater than in vessel a with a radius of 1

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The heart

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is a four chambered pump consisting of two atria the rt atrium which received blood returning to the heart from the systemic circulation

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the lt atria

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which receives oxygenated blood from the lungs

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the rt atria

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which receives blood returning to the heart from the systemic circulation

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the rt ventricle

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which pumps blood to the lungs

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the left ventricle

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which pumps blood into the systemic circulation