In anaerobic respiration,the pyruvic acid in muscle will form:

$NADH_2$ generated in glycolysis produces $ATP$ in $ETS$ in the presence of $O_2$. In the absence of $O_2$,this $NADH_2$ functions as:

During lactic acid fermentation, . . . . . .

Identify the correct combination of $A$, $B$, and $C$ involved in lactic acid fermentation.
$C_6H_{12}O_6 \rightarrow A + B \rightarrow$ Lactic acid + $C$

$80\%$ of the lactic acid is converted to . . . . . . in the liver.

The energy-releasing metabolic process in which substrate is oxidized without an external electron acceptor is called: