Question

Anaerobic breakdown of glucose in our muscles produces
A. Pyruvate
B. Lactic acid
C. Ethyl alcohol
D. Oxalic acid

Answer 1

Hint: When small quantities of oxygen are available, the anaerobic breakdown of glucose takes place. Anaerobic glycolysis is the transformation of glucose to lactate. During fast, vigorous exercise, anaerobic glycolysis is only an efficient means of energy production, supplying energy for a time ranging from 10 seconds to 2 minutes.

Complete answer: A chemical byproduct of anaerobic respiration is lactic acid or lactate. It is the mechanism by which cells create energy without oxygen around them. There is the lactic acid in our blood as well, where it is deposited by muscle and red blood cells. During a physical exercise, anaerobic respiration occurs most frequently in humans. They have to turn to an anaerobic pathway to process energy as muscle cells use up their oxygen in order to meet the high demands of the body. The pyruvate undergoes complete breakdown in the mitochondria in the presence of oxygen in aerobic respiration after glycolysis (in the cytoplasm), generating energy from glucose along with by-products such as water and carbon dioxide that are readily expelled by breathing. Although producing lactic acid from pyruvate in the cytoplasm, which cannot be easily expelled, anaerobic respiration produces less energy. Lactic acid builds up and induces soreness and weakness in the muscles.
First of all, glucose is converted into pyruvate by glycolysis.
${{C}_{6}}{{H}_{12}}{{O}_{6}}\to Pyruvate$
Then the further breakdown of pyruvate takes place, either aerobically or anaerobically.
The equation of glucose breakdown in an anaerobic manner is:
$Pyruvate\to 2{{C}_{2}}{{H}_{5}}OH+2C{{O}_{2}}+2ATP\to \overset{\left( Lactic\text{ }acid \right)}{\mathop{2{{C}_{3}}{{H}_{6}}{{O}_{3}}}}\,+2ATP$
In aerobic respiration 38 molecules of ATP are generated whereas in anaerobic respiration only 2 molecules of ATP are produced. It has a $C{{H}_{3}}CH\left( OH \right)COOH$ molecular formula. In the solid-state, it is white and it mixes with water. It forms a colourless solution when in the dissolved state. Artificial synthesis as well as natural sources are protected by output. Owing to the presence of a hydroxyl group adjacent to the carboxyl group, Lactic acid is an alpha-hydroxy acid (AHA).
Hence, option B is the correct answer.

Note: Lactic acid production is the cause of cramps in muscles. Lactic acid is used in many organic synthesis sectors and in different biochemical industries as a synthetic intermediate. Sour milk products, such as koumiss, laban, yoghurt, kefir, and some cottage cheeses, are mainly found with lactic acid. Lactic acid is also responsible for sourdough bread's sour taste.