Sweat contains

Options

A. NaCl
B. Lactic acid
C. Small amount of urea
D. All of these

Answer

To answer the question "What does sweat contain?", we can follow these steps:

### Step 1: Understand the Composition of Sweat
Sweat is primarily composed of water, but it also contains various solutes that are important for bodily functions.

### Step 2: Identify Key Components
The main components of sweat include:
- **Sodium Chloride (NaCl)**: This is common table salt and is one of the primary electrolytes lost in sweat.
- **Lactic Acid**: This is produced during metabolism and can be found in sweat.
- **Urea**: A waste product formed from the breakdown of proteins, which is also present in small amounts in sweat.

### Step 3: Combine the Components
Since sweat contains all of these components (NaCl, lactic acid, and urea), we conclude that the correct answer encompasses all of them.

### Step 4: Select the Correct Option
Based on the components identified, the correct answer to the question "Sweat contains" is option D, which states "all of these".

### Final Answer:
Sweat contains NaCl, lactic acid, and a small amount of urea. Therefore, the correct answer is option D: all of these.

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