What are blood platelets a source of?

Which type of white blood cells are associated with the secretion of histamine and the anticoagulant heparin?

$A$ reduction in their number will lead to excessive loss of blood from the body.

Antigen $A$ and antibody $b$ are present in which blood group?

Which is the primary cation present in the blood plasma?

If you are to collect blood from a patient and store it in a test tube for the separation of blood cells and plasma,which of the following test tubes would you $NOT$ use?