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प्रश्न
Which one of the following does not have valves?
पर्याय
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
What stops blood from flowing backward through the heart?
Describe the functions of White blood cells.
Name the following:
Components of blood
Given below are the diagrammatic sketches of two kinds of blood vessels.
(a) Identify the two kinds of blood vessels A and B.
(b) name the parts numbers 1 to 6
(c) Mention any two main differences between A and B.
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.
Name the Following
The blood vessels which have valves in them.
Complete the following sentence with appropriate word:
__________ are the blood vessels which usually carry oxygenated blood.
Which type of blood flows through pulmonary veins?
At the venous end of the capillary bed, the osmotic pressure is ______.
Analogy:
Carry oxygenated blood: Arteries.
Carry deoxygenated blood: ______.
