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Given below are four statements (i-iv) regarding human blood circulatory system.
I. Arteries are thick-walled and have narrow lumen as compared to veins.
II. Angina is acute chest pain when the blood circulation to the heart is increased.
III. Persons with blood group AB can donate blood to any person with any blood group under ABO system.
IV. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

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An Intiative by Sri Chaitanya

I and II

III and IV.

I and IV

II and III

answer is A.

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Detailed Solution

Arteries are thick-walled and have narrow lumen as compared to veins.

Calcium ions play a very important role in blood clotting.

Angina is acute chest pain when the blood circulation to the heart is decreased.

Persons with blood group O can donate blood to any person with any blood group under ABO system.

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