___________ are network of thin tubes that are responsible for exchange of essential materials between blood and tissues.
A
Arteries
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B
Veins
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C
Capillaries
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D
Both (a) & (b)
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Solution
The correct option is C Capillaries Capillaries are the blood vessels responsible for the exchange of essential materials between blood and tissues. Capillaries are the smallest and thin walled blood vessels involved in the diffusion of nutrients, hormones and gases into the tissue cells.