periodic classification of elements — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10Scienceperiodic classification of elements4 Marks
Question
Explain : The tubes-blood vessels
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Answer
It includes arteries, veins and capillaries. All the three ducts perform heart's transport function. → Arteries :
$(1)$ Arteries are the vessels which carry blood away from the heart to various organs of the body.
$(2)$ Its wall is thick and elastic. It has three layered outer covering to protect it.
$(3)$ Blood emerges from the heart under high pressure.
$(4)$ It normally carries oxygenated blood. (Except pulmonary artery) -→ Veins :
$(1)$ It collects blood from different organs and bring it back to the heart.
$(2)$ Its wall is thin and three layered. They do not need thick walls because the blood is no longer under pressure.
$(3)$ They have valves that ensure that the blood flow only in one direction.
$(4)$ It mainly carries deoxygenated blood (blood carrying carbon dioxide) except (pulmonary vein) → Capillaries :
On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one-cell thick and are called capillaries. Exchange of material between the blood and surrounding cells take place across this thin wall. The capillaries then join together to form veins that convey the blood away from the organ or tissue.
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