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Valves are present in
Atria, veins, ventricles
SA node, AV node and arteries
Pacemaker, veins and arteries
All of the above
Answers (1)
In heart, to prevent the backflow of blood or to maintain unidirectional flow of blood, following specialised valves are present in heart
1. Tricuspid valve - It guards the right atrio-ventricular opening and it has three flaps. During ventricular contraction, it prevents backflow of blood from the right ventricle into the right atrium
2. Pulmonary valve ( semilunar) - It is present in the form of three half- moon shaped pockets at the base of the pulmonary trunk and aorta. These allow free and forward flow of blood, however, prevents backward flow from pulmonary trunk into right ventricle
3. Mitral valve (bicuspid valve) - The atrioventricular opening between the left atrium and the left ventricle is guarded by mitral valve or bicuspid valve. It prevents backflow from the left ventricle into the left atrium
4. Aortic valve - It is present at the initial point of aorta and prevents backflow of blood from the aorta into the left ventricle
5. Eustachian valve - It is located at the opening of superior vena cava and prevents backflow of blood from right atrium
6. Thebasian valve ( coronary valve) - This valve is present over the opening of coronary sinus and prevents backflow of blood from the right atrium
Valves are found in atria, veins and ventricles. Hence, the correct answer is option a.
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