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प्रश्न
Give reason:
Valves are present in the veins.
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उत्तर
- The main function of the valves in veins is to prevent backflow of blood.
- They are thin walled with semilunar valves to prevent backward flow of blood.
- Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow.
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संबंधित प्रश्न
What are the components of the transport system in human beings? What are the functions of these components?
Draw a diagram of the human heart and label its parts.
Describe the function of Heart.
Name the main parts of the circulatory system.
Draw labelled diagram of internal structure of human heart.
Label right atrium, mitral valve, left ventricle and pulmonary semilunar valve.
Write a function of Eustachian and tricuspid valve found in human heart.
The normal human heartbeat rate is about ______ time per minute.
Name two-layered protective covering of the human heart.
Why are the walls of the left ventricle thicker than the other chambers of the heart?
______ externally separates ventricles from each other.
Observe the diagram, Identify the parts labelled as P, Q, R, S. Choose the correct option for the conduction of cardiac impulse.
