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 ...
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 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 direction...
It comprises of four primary blood vessels that facilitate the transportation of blood rich in oxygen and deoxygenated blood to and from the heart and body tissues.Answer and Explanation: What are the valves of the heart? What is the function of these valves? Heart valves are the ...
The heart is a beating muscle that pumps blood throughout the body. Inside the heart, four valves open and close in precise sequence to keep the blood moving in the appropriate direction. Two of the heart's valves control the flow of blood from the upper chambers of the heart, or atria...
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...
A cardiac valve prosthesis in which each closing body has a skeleton line which is curved in the area of the swivel axis. The curved area is followed by a rectilinear area, thus causing a linear cross sectional enlargement in the outlet region of the passage formed by the closing bodies. ...
美 英 un.心脏瓣 英汉 un. 1. 心脏瓣
Since the first successful implantation of a prosthetic heart valve four decades ago, over 50 different designs have been developed including both mechanical and bioprosthetic valves. Today, the most widely implanted design is the mechanical bileaflet, with over 170,000 implants worldwide each year. ...
heart(redirected from Heart (anatomy))Also found in: Dictionary, Thesaurus, Medical. Related to Heart (anatomy): Heart valvesheart 1. the hollow muscular organ in vertebrates whose contractions propel the blood through the circulatory system. In mammals it consists of a right and left atrium and...