Consider the following four statements regard | vedclass

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(D) Statement $(a)$ is correct: Arteries have thick,elastic walls and a narrow lumen to maintain high blood pressure.Statement $(b)$ is correct: Angin

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$(a)$ and $(d)$

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(D) Statement $(a)$ is correct: Arteries have thick,elastic walls and a narrow lumen to maintain high blood pressure.Statement $(b)$ is correct: Angina pectoris is a condition characterized by acute chest pain when not enough oxygen is reaching the heart muscle.Statement $(c)$ is incorrect: $A$ person with $AB$ blood group is a universal recipient,not a universal donor. $A$ person with $O$ blood group is a universal donor.Statement $(d)$ is correct: Calcium ions $(Ca^{2+})$ are essential cofactors in the coagulation cascade that leads to blood clotting.Since statements $(a)$,$(b)$,and $(d)$ are correct,the combination $(a)$ and $(d)$ is a valid pair among the options provided.

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