Question

Lactic acid production has occurred in the athlete while running in the 400
m race. Which of the following processes explains this event?
a) Aerobic respiration
b) Anaerobic respiration
c) Fermentation
d) Breathing​

Answer 1

Answer:

b) Anaerobic respiration

Explanation:

EXPLANATION :

Sometimes, when there is a lack of oxygen in our muscle cells, another pathway for the break-down of pyruvate is taken. Here the pyruvate is converted into lactic acid which is also a three-carbon molecule. This build-up of lactic acid in our muscles during sudden activity causes cramps.

This Anaerobic Respiration takes place in our muscle cells often when we do difficult works like running long distance , exercise a lot. You must have surely experienced it !

★ EQUATION OF ANAEROBIC RESPIRATION THAT TAKES PLACE IN OUR MUSCLE CELLS :

$\rm C_{6}H_{12}O_{6} \: { ( Glucose)\: (6 - carbon \: molecule)} \: \underset{ \rm{} }{\xrightarrow{\text{ In \: Cytoplasm }}} \: 2 \: \: C_{3}H_{4}O_{3} \: (Pyruvate)(3 - carbon \: molecule) \: \underset{ \rm{In \: our \: muscle \: cells} }{\xrightarrow{\text{ Lack \: of \: oxygen}}} \: \: C_ 3 H_ 6 O_ 3 \: (Lactic \: Acid) (3 - Carbon \: molecule) \: + \: Energy \: (2 \: ATP)$

Answer 2

Explanation:

Anaerobic respiration occurs in muscles during exercise due to insufficient availability of oxygen. Aerobic respiration requires more energy than anaerobic respiration because in anaerobic respiration glucose is incompletely broken down. Due to incomplete breakdown, lactic acid is produced instead of carbon dioxide and water later.

Thus, the correct answer is option B