[(a) and (d)] Given below are four statements (a-d) regarding human blood circulatory system(a) Arteries

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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

(d) Calcium ions play a very important role in blood clotting

Which two of the above statements are correct?

(a) and (b)

(a) and (d)

(b) and (c)

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