STD 11 - 2. Biology classification — BIOLOGY STD 11 Science — Question

 $\begin{array}{|l|l|} \hline Column\,\,-I   & Column\,\,-II \\ \hline 1.\,\,97\,\,percent\,\,of\,\,O_2\,\,is\,\,transported & p.\,\,Bicarbonate \\ \hline 2.\,\,70\,\,percent\,\,of\,\,CO_2\,\,is\,\,transported & q.\,\,RBC  \\ \hline 3.\,\,100\,\,\,ml\,\,of\,\,oxygenated\,\,blood & r.\,\,4\,\,\,ml\,\, \\ \hline 4.\,\,100\,\,\,ml\,\,of\,\,deoxygenated\,\,blood & s.\,\,5\,\,\,ml \\ \hline \end{array}$

$I$. $ECG$ is of a great clinical significance

$II$. Electrocardiograph is the recording of electrical changes in cardiac muscles during the cardiac cycle

$III$. To obtain a standard $ECG$, a patient is connected to the machine with $3$ electrical electrodes (one to each wrist and to the left ankle)

$IV$. Normal activities of the heart are regulated intrinsically

$V$. Electrocardiogram is the electrical activity of heart

The option with correct statements is