The heart valves open and close due to A. stimulation by the sympathetic(交感) and parasympathetic(副交感) nerves B. a pressure difference on the two sides of the valve C. Na+ and K+ fluxes during ventricular depolarization D. turbulent flow in the atria and ventricles E. None of the ...
The flow of blood through the heart is controlled by four�valves: thetricuspid,�pulmonary semilunar,�mitral, and�aortic semilunar valves. The�tricuspid valve�controls the opening between the right atrium and the right ventricle. The�pulmonary semilunar valve�is located between the...
There is only one place in the human body with three duplicate heart valves, called the tricuspid valve. The valves of the heart are structures which ensure blood flows in only one direction. They are composed of connective tissue and endocardium (the inner layer of the heart). There are fo...
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Define Heart valves. Heart valves synonyms, Heart valves pronunciation, Heart valves translation, English dictionary definition of Heart valves. Noun 1. heart valve - a valve to control one-way flow of blood cardiac valve ticker, heart, pump - the hollow
If the causing bacteria is very virulent, the endocarditis has a fulminant course and often a fatal outcome. On the other hand, when the bacteria are not so virulent they can persist for some time in the heart causing valves deformities. It is interesting that Streptococcus viridans is ...
atrioventricular valve- either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium semilunar valve- a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart ...
A heart murmur is an additional noise that can be heard with a stethoscope along with the heartbeat. The noise is caused because of the irregular flow of blood through the heart. A heart murmur might be an indication of heart valve disease....
The heart valves control how the blood flows into its different chambers. The chambers consist of two ventricles and two atria. The valves in the heart open at different times to guide the blood through the ventricles and atria and to make sure that the blood will only flow in one ...
Most patients are out of bed on the day after an operation and may be back at work in two or three weeks. Many developments in modern surgery are almost incredible. They include the replacement of damaged blood vessels with simulated ones made of plastics; the replacement of heart valves ...