The $pH$ of human blood is:

Blood group $O$ has:

Which one of the following cells secrete heparin,histamine and serotonin?

The deficiency of vitamin $K$ results in the reduction of

The buffer salts present in the blood are

$A$ blood test of a person suspected of having anemia shows large,immature,nucleated,hemoglobin-deficient erythrocytes. Which of the following substances should be included in their diet to alleviate these symptoms?