Answer:
A type B+ patient can receive blood from:
(a) a type B+ blood sample
(b) a type O+ blood sample
(c) a type B- blood sample
(d) a type O- blood sample
Explanation:
There are four blood types known as A, B, AB and O
Different blood types have proteins known as antigens which are attached to them. Type A has antigen A, type B has antigen B, type AB has both antigens A and B, while type O has neither A nor B antigens.
The human immune system naturally produces antibodies against antigens that are not found in its own blood, hence blood type A produces antibodies B antigens, type B produces no antibodies against antigen A or B and type O produces antibodies against antigens A and B. Hence, a type A patient can only receive a type A or type O blood; a type B patient can only receive a type B or O blood; a type AB patient can receive a type A blood, a type B blood or a type O blood; a type O blood can only receive a type O blood.
Rhesus is an antigen that occurs naturally in the blood of some humans (85% statistically). Humans having this antigen are rhesus positive and bear the "+" sign in front of their blood type, while a rhesus negative human bears the "-" sign in front of their blood type. A rhesus + patient can receive a rhesus + or rhesus - blood but a rhesus - patient can only receive a rhesus - blood.
Therefore, a type B+ patient can only receive blood from:
(a) a type B+ blood sample
(b) a type O+ blood sample
(c) a type B- blood sample
(d) a type O- blood sample
