General Physiology_Nohe_Date_050310

General Physiology_Nohe_Date_050310 - Chapter 12 Review...

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Chapter 12 Review Guide Important Concepts: Pressure, Volume, Flow, Resistance Pressure falls over distance as energy is lost to friction Hydrostatic pressure is the pressure exerted on the walls of the container by the fluid within a container. It is proportional to the height of the column Pressure Change Pressure created by contracting muscles is transferred to blood Driving pressure is created by the ventricle If blood vessels constrict, blood pressure increases Volume change is the major factors for blood pressure in CVS Fluid Flow Fluid flows only if there is a positive pressure gradient o Higher → Lower o P 1 -P 2 = P (pressure gradient) o Flow depends on pressure gradient not absolute Pressure Role of Radius in Determining Resistance to Flow Resistance = 1/radius 4 o So the bigger the radius, less resistance Flow = 1/resistance o Less resistance more flow Structure of the Heart The heart is on the ventral side of the thoracic cavity between the lungs Composed of myocardium (cardiac muscle) Encased in pericardium Journey of Blood through the Heart Right atrium receives blood from the venae cavae and sends it to the right ventricle The right ventricle receives blood from the right atrium and sends it to the lungs The left atrium receives blood from the pulmonary veins and sends it to the left ventricle The left ventricle receives blood from the left atrium and sends it to the rest of the body Journey of Blood through Vessels The Venae cavae receives blood from the systemic veins and sends it to the right atrium The pulmonary trunk (artery) receives blood from the right ventricle and sends it to the lungs. The pulmonary veins receive blood from the veins of the lungs and send it to the left
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General Physiology_Nohe_Date_050310 - Chapter 12 Review...

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