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Given below are four statements (a-d) regarding the 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 of 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?
A. (c) and (d)
B. (a) and (d)
C. (a) and (b)
D. (b) and (c)

Last updated date: 20th Jun 2024
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Hint: a human is the most developed organism in the whole classification given by all scientists. Asper that they have an also well developed circulatory system which is considered as the double circulation. So that it is different from all other organisms. Hunan also has different types of blood groups according to their antigen present in the blood.

Complete answer:
The walls of arteries are thicker than that of veins to face up to pulsatile flow and better blood pressures.
Compared to arteries, veins have larger diameters and diluent walls. They, therefore, have larger lumens and contribute capacitance to the circulation, holding around a common fraction of all current blood.
In the blood clotting method, the presence of metal ions and alternative natural action factors, clotting factor activates associate catalysts referred to as coagulation factor matter.
This catalyst then converts the protein coagulation factor into coagulase.
Thrombin is an associate catalyst that, in turn, converts factor I to protein. Angina is acute pain once the blood circulation of the guts muscles is reduced.
Persons with people AB will receive blood from someone with any people beneath the ABO group.

So, the right answer is choice B.
Additional info: Clotting factors:
1. factors help in blood clotting.
2. These factors are mainly produced in the liver.
3. Vitamin K is required in the synthesis of these clotting factors.
4. These factors are represented in Roman numbers.
I. Fibrinogen
II. Prothrombin
III. Thromboplastin
IV. $C{a^ + }$ (cofactor in each step of blood clotting
V. Proaccelerin
VI. Accelerin (Rejected)
VII. Proconvertein
VIII. AHG (Antihemophilic Globulin)
(Absent in haemophilia-A)
IX. Christmas factor/plasma thromboplastin co-factor
X. Stuart factor
XI. PTA (Plasma thromboplastin antecedent)
XII. Hagman factor (become active by friction)
XIII. FSF factor (Fibrin stabilising factor) (Laki lowand factor).

blood clotting of human beings continues in a process. So there is no need to explain but remember that thromboplastin is the most important thing for blood clotting as well as fibrinogen. And the human blood group is identified as the antigen present in human blood and noted that +/-ve group is defined as the Rh factor present in blood also.