题目内容

Erythrocytes originate in the bone marrow, and their production is stimulated by______ which is secreted by the kidney.

A. erythropoietin
B. endothelium
C. urea
D. rennin

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Which chemical cannot be classified into a protein?

A. heparin
B. erythropoietin
C. interleukin
D. fibrin

The liquid portion of blood is termed______

Platelets are produced by certain giant cells termed___

some monocytes enter the tissues and mature into phagocytic cells termed_