Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Sometimes, when there is a lack of oxygen in our muscle cells, the pyruvate by anaerobic respiration is converted into:
ethyl alcohol
methyl alcohol
acetic acid
lactic acid
lactic acid
During periods of intense physical activity, muscle cells experience a temporary lack of oxygen because the demand for energy outpaces the oxygen supply from the blood. To continue producing ATP (adenosine triphosphate) for muscle contraction, cells switch to anaerobic respiration, converting pyruvate into lactic acid.
During periods of intense physical activity, muscle cells experience a temporary lack of oxygen because the demand for energy outpaces the oxygen supply from the blood. To continue producing ATP (adenosine triphosphate) for muscle contraction, cells switch to anaerobic respiration, converting pyruvate into lactic acid.
Think of it like a backup generator in a building: when the main power grid (oxygen-dependent respiration) fails due to high load, the emergency generator (anaerobic glycolysis) kicks in to keep the lights on, though it produces more waste and is less efficient than the main system.
L-A-M: Lactic Acid in Muscles.
C6тАЛH12тАЛO6тАЛтЖТ2C3тАЛH6тАЛO3тАЛ+2ATP тАФ Simplified representation of anaerobic glycolysis in human muscle cells, showing glucose converting to lactic acid and producing energy.
In the absence of sufficient oxygen, the mitochondria cannot fully oxidize pyruvate via the Krebs cycle and electron transport chain. Instead, the enzyme lactate dehydrogenase reduces pyruvate into lactic acid, a process that regenerates NAD+, which is essential for the glycolytic pathway to continue functioning. The accumulation of lactic acid contributes to muscle fatigue and soreness.
Anaerobic respiration occurs in the cytoplasm of the muscle cells.
Lactic acid accumulation is responsible for the transient muscle fatigue experienced during high-intensity exercise.
The process is less efficient than aerobic respiration, producing only 2 ATP molecules per glucose molecule compared to up to 38 in aerobic conditions.
Provides rapid supply of ATP for quick bursts of movement.
Allows continued activity when oxygen delivery to muscle tissue is limited.
Produces lactic acid which lowers local pH and leads to muscle fatigue.
Significantly lower energy yield compared to aerobic processes.
Short-distance sprinting.
Weightlifting.
Heavy resistance training.
Ethyl alcohol (Ethanol) is produced in anaerobic fermentation by yeast cells, not human muscle cells.
Acetic acid is produced by bacteria in the process of acetification (e.g., vinegar production).
Methyl alcohol is toxic and not a byproduct of human cellular respiration.
D is correct тАФ In human muscle cells, the lack of oxygen leads to the conversion of pyruvate into lactic acid during anaerobic respiration.
Remember that muscle cells perform 'Lactic Acid Fermentation', while yeast cells perform 'Alcoholic Fermentation'. Distinguishing between these is a common high-yield question in biology.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants