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Exams - NEET

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 to 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?

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