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Blood Circulation


Pulmonary Circulation -Moves blood to and from the lungs -Pulmonary trunk: Arises from right ventricle. -Pulmonary arteries: Branches of pulmonary trunk which project to lungs. Pulmonary veins: Exit each lung and enter left atrium.
Systemic Circulation: Arteries -Aorta-- From which all arteries are derived either directly or indirectly -Parts--- Ascending, descending, thoracic, abdominal Coronary arteries Supply the heart
Systemic Circulation: Veins Return blood from body to right atrium -Major veins= Coronary sinus (heart) Superior vena cava (head, neck, thorax, upper limbs) Inferior vena cava (abdomen, pelvis, lower limbs) -Types of veins= Superficial, deep, sinuses
Dynamics of Blood Circulation Interrelationships between -Pressure -Flow -Resistance -Control mechanisms that regulate blood pressure -Blood flow through vessels
Blood Pressure Measure of force exerted by blood against the wall Blood moves through vessels because of blood pressure --Measured by listening for Korotkoff sounds produced by turbulent flow in arteries as pressure released from blood pressure cuff
Pulse Pressure Difference between systolic and diastolic pressures: --Increases when stroke volume increases or vascular compliance decreases --Pulse pressure can be used to take a pulse to determine heart rate and rhythmicity
Blood Flow -Amount of blood moving through a vessel in a given time period. -Directly proportional to pressure differences, inversely proportional to resistance
Poiseuille’s Law ---Flow decreases when resistance increases ---Flow resistance decreases when vessel diameter increases
Viscosity --Measure of resistance of liquid to flow --As viscosity increases, pressure required to flow increases
Critical closing pressure Pressure at which a blood vessel collapses and blood flow stops
Laplace’s Law Force acting on blood vessel wall is proportional to diameter of the vessel times blood pressure
Vascular compliance Tendency for blood vessel volume to increase as blood pressure increases More easily the vessel wall stretches, the greater its compliance Venous system has a large compliance and acts as a blood reservoir
Created by: zeenat



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