By Y. C. Fung
Read or Download Biodynamics: Circulation PDF
Best bioengineering books
This entire ebook provides an in depth account of researchand fresh advancements within the box of eco-friendly full of life materials,including pyrotechnics, explosives and propellants. This zone isattracting expanding curiosity locally because it undergoes atransition from utilizing conventional approaches, to moreenvironmentally–friendly strategies.
Bioengineering and Biophysical features of Electromagnetic Fields essentially includes discussions at the physics, engineering, and chemical points of electromagnetic (EM) fields at either the molecular point and bigger scales, and investigates their interactions with organic platforms. the 1st quantity of the bestselling and newly up to date guide of organic results of Electromagnetic Fields, 3rd variation, this e-book provides fabric describing fresh theoretical advancements, in addition to new information on fabric homes and interactions with susceptible and robust static magnetic fields.
This ebook encapsulates over 3 many years of the author’s paintings on comparative sensible breathing morphology. It offers insights into the mechanism(s) wherein respiration capability and strategies originated and complex to their glossy states. Pertinent cross-disciplinary info and proof were built-in and reexamined with a purpose to arrive at extra powerful solutions to questions concerning the foundation of the sensible designs of gasoline exchangers.
R. MARKS Biology has develop into a 'numbers game'. some great benefits of having the ability to grade adjustments in tissue, publish effects to statistical research and competently list organic phenomena make size crucial. this can be as actual for many of the disciplines in utilized biology because it is for the extra esoteric elements ofthe topic.
Extra resources for Biodynamics: Circulation
How the pump works is the subject of this chapter. In each cycle the left and right ventricles are first filled with blood from the left and right atria, respectively, in the diastolic phase of the cycle. Then by the deceleration of the blood stream a pressure field is generated, which closes the valves between the atria and the ventricles . The contraction of the heart muscle begins and the pressures in the ventricles rise. When the pressure in the left ventricle exceeds that in the aorta, and the pressure in the right ventricle exceeds that in the pulmonary artery, the aortic valve in the left and the pulmonary valve in the right are pushed open, and blood is ejected into the aorta and the lung.
Phase 2 represents isovolumic pressure development. Phase 3 represent s ejection of blood into the aorta. Phase 4 represents the isovolumic relaxation period . the four phases of the cardiac cycle. The area within the loop describes the external work (stroke work) done by the left ventricle as it contracts. The lower curve of the loop, phase I, (the arc AB in Fig. 4: 4), represents the ventricular filling. During this period the heart is in dia stole and the muscle is resting . The curve AB, therefore, should be the same as the pressure-volume (P- V) curve of a resting heart.
I) The solution of this differential equation is r' . (RK ), (2) where Po is the value of p at time t = O. This gives the pressure in the aorta as a function of the left ventricle ejection history Q (t ). Equation (2) work s remarkably well in correlating experimental data on the total blood flow Q with the blood pressure p, particularly during diastole. (See McDonald 1974, pp. ) Hence , in spite of the severity of the underlying assumptions it is quite useful. Turning now to the question of stress in the heart itself, there is another very simple anal ysis that is quite good.
Biodynamics: Circulation by Y. C. Fung