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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
Name the Following
Layer, which surrounds the heart.
Complete the following sentence with appropriate word:
The average heartbeat rate is ____ beats per minute in human being.
Multiple Choice Questions
The beating of the heart of man is heart on the left side, because:
The free edges of cuspid valves are attached to the papillary muscles of the heart by fibres are called ______.
The normal human heartbeat rate is about ______ time per minute.
Calculate the heart rate of a person if the cardiac output is SL, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50mL.
The inner surface of the ventricle is thrown into series of irregular muscular ridges called ______
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.
The heart is surrounded by a double-layered membrane called ______.
Distinguish between the following pair on the basis of words indicated in the bracket ( ):
Mitra! valve and Tricuspid valve (Location)
