ICSE-X-Biology
06: The Circulatory System
- #1Given below are the diagrammatic sketches of two kinds of blood vessels.
(a) Identify the two kinds of blood vessels A and B. (b) name the parts numbers 1 to 6 (c) Mention any two main differences between A and B.Ans : (a) A is artery, B is vein. (b) 1- Endothelium of the artery,
2 - Middle layer of smooth muscles and elastic fibres of the artery, 3 - External layer of connective tissue of the artery, 4 - Endothelium of the vein, 5 - Middle layer of smooth muscles and elastic fibres of the vein,
6 - External layer of connective tissue of the vein. (c) An artery has thick muscular walls and a narrow lumen. It carries blood away from the heart towards any organ. A vein on the other hand has thin muscular walls and a wider lumen. It carries blood away from an organ towards the heart.
- #1-aIdentify the two kinds of blood vessels A and B.Ans : A is artery, B is vein.
- #1-bname the parts numbers 1 to 6Ans : 1- Endothelium of the artery,
2 - Middle layer of smooth muscles and elastic fibres of the artery, 3 - External layer of connective tissue of the artery, 4 - Endothelium of the vein, 5 - Middle layer of smooth muscles and elastic fibres of the vein,
6 - External layer of connective tissue of the vein.
- #1-cMention any two main differences between A and B.Ans : An artery has thick muscular walls and a narrow lumen. It carries blood away from the heart towards any organ. A vein on the other hand has thin muscular walls and a wider lumen. It carries blood away from an organ towards the heart.