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प्रश्न
Which one of the following does not have valves?
विकल्प
Heart
Arteries
Capillaries
Veins
उत्तर
Arteries
Veins carry deoxygenated blood (except pulmonary vein) from various parts of the body to the heart. The blood in veins flows with less pressure. Therefore, veins have valves to prevent the backflow of blood. The arteries carry blood from the heart to the other body parts. The blood in arteries flow at high pressure and so the blood flows only in one direction. So, arteries do not require valves as the chances of backflow are less. The heart has valves between the atria and ventricles. They prevent the backflow of blood from the ventricles to the atria.
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संबंधित प्रश्न
State the differences between artery, vein and capillary.
Put a tick mark (✓) against the correct alternative in the following statement:
Nucleus is absent in
- RBCs
- WBCs
- All blood cells
- Liver cells.
Describe the functions of White blood cells.
Define the term Veins.
Study the following diagram carefully:
(a) With which figure in the chapter can you roughly compare this diagram?
(b) Write any two things shown in it as extra from those in the figure named above.
A muscular wall is absent in ______.
Name the Following
The blood vessel supplying blood to the kidney.
Complete the following sentence with appropriate word:
The blood vessel leaving the left ventricle of the mammalian heart is the _________.
Long answer question:
Which blood vessel of the heart will have the maximum content of oxygen and why?
Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
