In muscles, anaerobic conditions change pyruvic acid to

Options

A. `C_(2)H_(5)OH`
B. `C_(3)H_(4)O_(3)`
C. `C_(3)H_(6)O_(3)`
D. `C_(2)H_(4)O`

Answer

To solve the question "In muscles, anaerobic conditions change pyruvic acid to," we will follow these steps:

### Step 1: Understand Anaerobic Conditions
Anaerobic conditions refer to an environment where oxygen is not present. In muscles, during intense exercise or when oxygen supply is limited, cells switch from aerobic respiration to anaerobic respiration.

**Hint:** Remember that anaerobic respiration occurs when oxygen is scarce.

### Step 2: Identify the Process in Muscles
In muscles, under anaerobic conditions, pyruvic acid (the product of glycolysis) is converted into lactic acid. This process is known as lactic acid fermentation.

**Hint:** Think about what happens to pyruvic acid when oxygen is not available.

### Step 3: Write the Reaction
The conversion of pyruvic acid to lactic acid can be represented by the following reaction:
\[ \text{Pyruvic Acid} + \text{NADH} \rightarrow \text{Lactic Acid} + \text{NAD}^+ \]

**Hint:** Recall that NADH is used to regenerate NAD+ in this process.

### Step 4: Analyze the Options
Now, let's look at the options provided:
- C2H5OH (Ethanol)
- C3H4O3 (Lactic Acid)
- C3H6O3 (Not a valid compound)
- C2H4O (Not a valid compound)

From our understanding, lactic acid is represented by the chemical formula C3H6O3.

**Hint:** Check the chemical formulas to see which one corresponds to lactic acid.

### Step 5: Conclusion
Since pyruvic acid is converted to lactic acid (C3H6O3) in muscles under anaerobic conditions, the correct answer is C3H6O3.

**Final Answer:** In muscles, anaerobic conditions change pyruvic acid to lactic acid (C3H6O3).