Which valves have tendons

Four valves maintain the unidirectional flow of blood through the heart. The valves are located between the atria and ventricles and in the two arteries that empty blood from the ventricles.

They are composed mostly of fibrous connective tissue that extends from the heart walls. The external surfaces of the valves are covered by endocardium. 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. Papillary muscles, finger-like projections from the wall of the ventricles, connect the chordae tendineae heartstrings to the cusps of the atrioventricular valves. This connection prevents the valve from prolapsing under pressure.

Papillary muscles, together with the chordae tendineae, make up the subvalvular apparatus. Key Terms Atrioventricular valves : These valves separate the atria from the ventricles on each side of the heart and prevent backflow from the ventricles into the atria during systole.

They include the mitral and tricuspid valves. Subvalvular apparatus : The papillary muscles and the chordae tendineae, known as the subvalvular apparatus, hold the valves closed so that they do not prolapse. By sharing this link, I acknowledge that I have read and understand the Terms and Conditions. Sie kommen aus Deutschland? This image is not available for purchase in your country. Please contact your Account Manager if you have any query. Caption Heart valve tendons. Keywords anatomy biology chordae tendineae coloured cord cords heart human body images magnified image microscopic photos muscle scanning electron micrograph sem subjects tendon tendons valve valves.

A normal heartbeat produces a regular, identifiable pattern: the P wave, the QRS complex, and the T wave. These segments…. Menu Map Call us. Heart Valves. More helpful information Bundle Branches The bundle branches are a part of the electrical system of the heart.