NEET 2010 Biology question
Given below are four statements (a-d) regarding human blood circulatory system (a) Arteries are thick-walled and have narrow lumen as compared to veins (b) Angina is acute chest pain when the blood circulation of the brain is reduced (c) Persons with blood group AB can donate blood to any person with any blood group under ABO system (d) Calcium ions play a very important role in blood clotting Which two of the above statements are correct?
Solution
(a) True: arteries carry blood at high pressure, so their walls are thick and elastic with a narrow lumen compared with veins. (b) False: angina (angina pectoris) is chest pain that occurs when the blood supply to the heart muscle is reduced, not the brain. (c) False: persons with blood
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