Science
Which of the following options indicates the products formed after breakdown of the glucose in our muscle cells when there is lack of oxygen?
options
- Ethanol + carbon dioxide + Energy
- Lactic acid + Energy
- Lactic acid + carbon monoxide + Energy
- Carbon dioxide + Water + Energy
Answer
Lactic acid + Energy
Reason — In our muscle cells, when we perform vigorous physical activity such as running or exercising, the demand for energy increases. However, the oxygen supply becomes insufficient for complete breakdown of glucose through aerobic respiration.
Under this condition, anaerobic respiration takes place in the muscle cells. During this process, glucose is partially broken down in the absence of oxygen to form lactic acid and a small amount of energy.
The chemical equation for this process is:
C6H12O6(Glucose) → C3H6O3(Lactic acid) + Energy
The accumulation of lactic acid in the muscles causes muscle fatigue and cramps. Once oxygen becomes available again, lactic acid is converted back into carbon dioxide and water with the release of more energy.
Thus, in the absence of oxygen, glucose breaks down into lactic acid and energy in human muscle cells.
Related Questions
Select the group in which all organisms have the same mode of nutrition.
options
- Cuscuta, yeast, legumes, leeches and tapeworm
- Cactus, ticks, lice, leeches and cow
- Cuscuta, ticks, lice, leeches and tapeworm
- Cactus, grass, lice, lion and tapeworm
Which of the following is a correct combination of function and part of the brain?
options
- Posture and balance: Cerebrum
- Salivation: Medulla in midbrain
- Hunger: Pons in hindbrain
- Blood pressure: Medulla in hindbrain
The blood glucose level in a patient was very high. It may be due to inadequate secretion of:
options
- Growth hormone from pituitary gland
- Oestrogen from ovary
- Insulin from pituitary gland
- Insulin from pancreas
In a cross between black furred rabbit (B) and white furred rabbit (b), all offspring were found to have black fur. What can be inferred about the genetic makeup of the parent rabbits?
options
- BB X bb
- Bb X Bb
- Bb X bb
- bb X bb