The bundle branches are a part of the electrical system of the heart. The electrical system controls the heartbeat and…. The bundle of His is a part of the electrical system of the heart.
It is a collection of cells…. The purpose of the electrical system of the heart is to coordinate the pumping of the four chambers of the…. The heart is divided into four chambers. The two upper chambers are called the atria. Click here for information on Cardiovascular Physiology Concepts, 3rd edition, a textbook published by Wolters Kluwer Klabunde This triggers excitation-contraction coupling , myocyte contraction and a rapid increase in intraventricular pressure.
Early in this phase, the rate of pressure development becomes maximal. The AV valves close when intraventricular pressure exceeds atrial pressure. Ventricular contraction also triggers contraction of the papillary muscles with their chordae tendineae that are attached to the valve leaflets.
The ring contracts at the end of atrial systole due to the contraction of the left atrium around it, which aids in bringing the leaflets together to provide firm closure during ventricular systole.
The tricuspid valve is the three-leaflet valve on the right side of the heart between the right atrium and the right ventricle and stops the backflow of blood between the two. The tricuspid valve functions similarly to the bicuspid valve except that three chordae tendineae connect the cusps of the valve to three papillary muscles, rather than the pair that connects the bicuspid valve. Blood passes through the tricuspid valve the same as it does through the bicuspid valve, based on a pressure gradient from high pressure to low pressure during systole and diastole.
The reason that the valves have different numbers of leaflets is not fully understood, but may arise from differences in tissue structure and pressure that occur during fetal development. Subvalvular Apparatus The subvalvular apparatus describes the structures beneath the AV valves that prevent the valves prom prolapsing.
The Mitral Valve The mitral valve is on the left side of the heart and allows the blood to flow from the left atrium into the left ventricle.
The Tricuspid Valve The tricuspid valve is the three-leaflet valve on the right side of the heart between the right atrium and the right ventricle and stops the backflow of blood between the two. Key Points The atrioventricular valves, the bicuspid mitral and tricuspid valves, separate the atria from the ventricles. The bicuspid valve is on the left side of the heart and the tricuspid valve is on the right side of the heart. Blood flows through an atrioventricular AV valve when blood pressure in the atria becomes high during atrial systole and blood pressure in the ventricles becomes low enough during ventricular diastole, creating a blood pressure gradient.
0コメント