MCQ
Which one of the following is correct?
- ASerum $=$ Blood $+$ fibrinogen
- BLymph $=$ Plasma $+ RBC + WBC $
- ✓Blood $=$ Plasma $+ RBC + WBC$
- DPlasma $=$ Blood $-$ Lymphocytes
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$I$. Located at lateral wall of the right atrium
$II$. Heart of heart
$III$. It initiates the rhythmic contractile activity of the heart
$IV$. It is called pace keeper of the heart
$V$. It is called pace maker of the heart
The option with correct statements is/are