Question

Why do capillaries need to be thin-walled?

Answer 1

capillaries need to be very thin because the capillaries are helpful in supplying oxygen to the different part of the body and the capillaries directly take oxygen from alveoli by contact with them .

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Answer 2

A single capillary is so small that it allows only one blood cell to flow through it at a time so capillaries need to be thin walled.