题目内容

Erythrocytes have a lifespan of approximately ______ days.

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The most common granular leukocyte is the _____ , a phagocytic white blood cell.

T lymphocytes are capable of attacking a foreign cell directly, producing _ immunity. B lymphocytes produce antibodies that inactivate the antigen, antibody-based immunity is referred to as _ immunity.

The two types of agranulocytes are _ and _.

Because of their oddly shaped nuclei, granulocytes are sometimes called _____ leucocytes.