Anaerobic respiration of animals/humans produces

Options

A. (a) `CO_2 and H_2O`
B. (b) `C_2H_5OH and CO_2`
C. (c) Lactic acid and `H_2O`
D. (d) Glucose and `O_2`

Answer

**Step-by-Step Solution:**

1. **Understanding Anaerobic Respiration:**
- Anaerobic respiration occurs in the absence of oxygen. In humans and animals, this process primarily takes place in skeletal muscles during intense exercise when oxygen supply is limited.

2. **Process of Anaerobic Respiration:**
- During anaerobic respiration, glucose is broken down through glycolysis to produce pyruvate. This process generates a small amount of ATP (energy) for the cells.

3. **Lactic Acid Fermentation:**
- In humans, the pyruvate produced from glycolysis is converted into lactic acid (lactate) through a process known as lactic acid fermentation. This conversion also regenerates NAD+, which is essential for glycolysis to continue.

4. **End Products of Anaerobic Respiration in Humans:**
- The main end products of anaerobic respiration in humans are:
- Lactic acid (lactate)
- Water (H2O)
- ATP (energy)

5. **Evaluating the Options:**
- A) CO2 and H2O - Incorrect, as CO2 is not produced in anaerobic respiration in humans.
- B) Ethanol and CO2 - Incorrect, as ethanol is produced in yeast during fermentation, not in human cells.
- C) Lactic acid and H2O - Correct, as these are the products formed during lactic acid fermentation in humans.
- D) Glucose and oxygen - Incorrect, as these are substrates for aerobic respiration, not products of anaerobic respiration.

6. **Conclusion:**
- The correct answer is C) Lactic acid and H2O.

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