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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.
संबंधित प्रश्न
Aqueous humour, Vitreous humour, lris, Central canal
Agranulocytes are :
Name the following:
The kind of blood cells which can squeeze out through the walls of one category of blood vessels.
Draw a neat and labelled diagram.
Internal structure of the heart.
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In which organ of our body does blood get oxygenated?
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
Given below is a schematic representation of the circulatory system in man. Study the same and answer the questions that follow:
(i) Label the parts 1 to 4 indicated in the diagram.
(ii) Give one difference between parts 1 and 2 based on:
(a) their structure
(b) the nature of blood flowing through them.
(iii) What is the specific name of the type of blood circulation that takes place between the heart and the lungs?
(iv) Name the valve found at the beginning of the part labeled 3.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The walls of auricles are thicker than those of ventricles.
_____ gas is transported to all parts of the body.
