Give the overall chemical reaction of anaerobic respiration in animals (human muscle cells).

Explanation

### Step-by-Step Text Solution:

1. **Understanding Anaerobic Respiration**: Anaerobic respiration occurs in the absence of oxygen. In human muscle cells, this typically happens during intense exercise when oxygen supply is limited.

2. **Starting Material**: The primary substrate for anaerobic respiration is glucose.

3. **Glycolysis Process**: The process begins with glycolysis, where one molecule of glucose (C6H12O6) is broken down into two molecules of pyruvate (C3H4O3). During this process, a net gain of 2 ATP (adenosine triphosphate) molecules and 2 NADH (nicotinamide adenine dinucleotide) molecules are produced.

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