Which protein is essential for the blood clotting process?

What is the average amount of hemoglobin present in $100 \ ml$ of blood?

$A -$ Fibrinogen is needed for the clotting of blood,and globulins are involved in defense mechanisms of the body.
$R -$ Factors for the coagulation of blood are present in the blood in an inactive form.

Name the immune protein present in the blood.

What is the typical maximum concentration of $Hb$ (hemoglobin) found in $RBC$s (in $\%$)?

Which of the following is a major ion found in blood?