MCQ
The pace-setter in the heart is called
- APurkinje fibres
- BSino-aterial node $(SAN)$
- CPapillary muscle
- ✓Atrio-ventricular node $(AVN)$
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$\begin{array}{|l|l|} \hline Column\,\,-I & Column\,\,-II \\ \hline 1.\,\,97\,\,percent\,\,of\,\,O_2\,\,is\,\,transported & p.\,\,Bicarbonate \\ \hline 2.\,\,70\,\,percent\,\,of\,\,CO_2\,\,is\,\,transported & q.\,\,RBC \\ \hline 3.\,\,100\,\,\,ml\,\,of\,\,oxygenated\,\,blood & r.\,\,4\,\,\,ml\,\, \\ \hline 4.\,\,100\,\,\,ml\,\,of\,\,deoxygenated\,\,blood & s.\,\,5\,\,\,ml \\ \hline \end{array}$
Reason : All life forms were in water environment only.