Consider the following four statements regard | vedclass

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(D) Statement $(a)$ is correct: Arteries have thick,elastic walls and a narrower lumen to maintain high blood pressure,whereas veins have thinner wall

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$(b)$ and $(d)$

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(D) Statement $(a)$ is correct: Arteries have thick,elastic walls and a narrower lumen to maintain high blood pressure,whereas veins have thinner walls and a wider lumen.Statement $(b)$ is correct: Angina pectoris is characterized by acute chest pain that occurs when not enough oxygen is reaching the heart muscle.Statement $(c)$ is incorrect: $A$ person with blood group $AB$ is a universal recipient,not a universal donor. $A$ person with blood group $O$ is a universal donor.Statement $(d)$ is correct: Calcium ions $(Ca^{2+})$ are essential cofactors in the coagulation cascade required for the conversion of prothrombin to thrombin and fibrinogen to fibrin.Therefore,statements $(a)$,$(b)$,and $(d)$ are correct. Among the given options,$(b)$ and $(d)$ are both correct.

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