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प्रश्न
Veins have valves at intervals in their inner lining whereas the arteries do not have valves. Explain.
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उत्तर
In arteries blood flows with pressure but in veins the pressure falls considerably and the back flow of blood is prevented by the semilunar valves.
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संबंधित प्रश्न
The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions which follow:
(i) Name the blood vessels labelled 1 and 2.
(ii) State the function of blood vessels labelled 5 and 8.
(iii) What is the importance of the blood vessel labelled 6?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
What is meant by human circulatory system? Name the organs of the circulatory system in humans.
Given below is certain structure, write the term for the functional activity.
Erythrocytes and …………………………………
When a doctor is recording your pulse, he is pressing on your wrist exactly on a
Why do people have a common belief that the heart is located on the left side of the chest?
Explain the structure and function of human blood.
pH of oxygenated blood is ______.
Which side of the heart (left or right) contains oxygenated blood?
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
Identify the INCORRECT match
