In anaerobic respiration,bacteria produce:

Given below are two statements.
$Statement-I$ - Skeletal muscles usually derive energy by anaerobic respiration.
$Statement-II$ - After vigorous exercise,lactic acid accumulates in muscle fibres,leading to muscle fatigue.
In the light of the above statements,choose the most appropriate answer from the options given below:

$A$ person who has done intensive exercise and lies down for rest,his heart beat fastens and is gasping for breath. He is said to have

Describe the process of fermentation in detail.

During anaerobic conditions,the increase in the rate of glycolysis is known as:

Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzymes