Solution: The eosinophils are a type of white blood cell that destroys parasites and plays a role in allergic reactions in the body. Hence, they resist infection.

Red blood cell, also known as erythrocyte, is a biological component of blood that gives the blood its characteristic color and transports oxygen from the lungs to the tissues of vertebrates. Hence, responsible for gaseous transport.

AB group has antigen A and B are present on red blood cells, but there is no antibody. Hence, it is known as the universal donor.

Platelets, also known as thrombocytes, are blood components whose purpose (together with coagulation factors) is to clump together in response to bleeding from a blood vessel injury, resulting in a blood clot. Hence, it is responsible for coagulation.

Systole is the heart’s contraction, or time of contraction, during which blood is pumped into the aorta and pulmonary artery.