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Hematology is the study of

Choose the correct statements regarding human blood:
$I$. The volume of blood in an adult is $5 \; L$.
$II$. It constitutes $30-35 \; \%$ of the total extracellular fluid.
$III$. Glucose concentration in the blood is $50 \; mg / 100 \; mL$.
$IV$. Cholesterol concentration in the blood is less than $200 \; mg / 100 \; mL$.
$V$. Urea level in the blood is $10 \; mg / 100 \; mL$.
The option with correct statements is:

If a person is injured and requires a blood transfusion,but the blood group of the patient is not checked,which of the following blood groups can be safely administered?

If one litre of blood is drawn out of $5 \; \text{litres}$ from the body of a man, how much blood would be left by the next day?

Three children in a family have blood types $O$,$AB$ and $B$ respectively. What are the genotypes of their parents?