alleryA blood vessel that is thin-walled, non-elastic, carries blood toward the heart and contains internal valves is best identified as which of the following?
AA vein
BA capillary
CAn artery
DAn arteriole
Answer & Solution
Correct answer: A. A vein
1. The clues are thin, non-elastic walls, blood flowing toward the heart, and internal valves.
2. Arteries are thick, elastic and lack internal valves, so option C is wrong.
3. Capillaries and arterioles are tiny vessels without internal valves, ruling out options B and D.
4. A thin, valved vessel returning blood to the heart is a vein, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Table 14.1", p.213_
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