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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
Fill in the blank with suitable word given below:
The blood loaded with carbon dioxide from the body comes into the __________ of the heart.
Name any four heart conditions that occur commonly.
Write a short note on human heart.
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
 |
- Name the phase.
- Which part of the heart is contracting in this phase? Give a reason to support your answer.
- Name the parts numbered 1to6.
- What type of blood flows through the parts marked 'l' and '2' respectively?
- How many valves are closed in this phase?
Draw the diagram of the Position of valves in the human heart.
State the Function: Coronary artery
For which of the following reason the left ventricle of human heart has its wall thicker than the right ventricle?
______ are muscular ridges at the inner surface of ventricles.
The heart is surrounded by a double-layered membrane called ______.
A man's heart rate is 68 and cardiac output is 5440. Find the stroke volume.
