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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
Draw a diagram of the human heart and label its parts.
Describe the function of Heart.
Label the following diagram :
Choose the correct answer:
In mammals the opening of post caval in the right auricle is guarded by _________
The free edges of cuspid valves are attached to the papillary muscles of the heart by fibres are called ______.
Complete the analogy.
The contraction of heart muscles: Systole:: Relaxation of heart muscles: ______.
Assertion: Human heart does not allow the mixing of oxygen to reach blood with carbon dioxide to reach the blood.
Reason: Human heart has different chambers.
Mammalian lungs have enormous number of minute alveoli, which permits more ______.
Ventricles give rise to two large blood vessels called ______ and ______.
Where is the following located?
Mitral valve
