A diver when goes very deep, he loses his strength to work and feel drowsy because

Options

A. Compressed air is used
B. More `CO_(2)` diffuses in muscles
C. More `N_(2)` is diffusing in blood
D. Nervous system does not work properly

Answer

### Step-by-Step Solution:

1. **Understanding Pressure Changes**: When a diver goes deep underwater, the pressure surrounding them increases significantly due to the weight of the water above. This increased pressure affects the gases dissolved in the diver's body.

**Hint**: Remember that pressure increases with depth in water, which affects gas solubility.

2. **Gas Behavior Under Pressure**: At high pressure, gases such as oxygen and nitrogen dissolve more readily in the blood. This means that while the diver is deep underwater, a larger amount of nitrogen is absorbed into their bloodstream compared to normal atmospheric pressure.

**Hint**: Consider how gases behave differently under varying pressures.

3. **Ascent and Decompression**: If a diver ascends too quickly from a deep dive, the rapid decrease in pressure can cause the nitrogen that was dissolved in the blood to come out of solution too quickly, forming bubbles. This process is known as decompression.

**Hint**: Think about what happens to dissolved gases when pressure is suddenly reduced.

4. **Effects of Nitrogen Bubbles**: The formation of nitrogen bubbles can lead to various symptoms, including weakness, drowsiness, joint pain, and headaches. These symptoms arise because the bubbles can obstruct blood flow and trigger inflammatory responses in the body.

**Hint**: Reflect on how bubbles in the bloodstream can affect bodily functions.

5. **Decompression Sickness**: The condition resulting from the formation of nitrogen bubbles is referred to as decompression sickness, which can have mild to severe symptoms depending on the extent of bubble formation and their location in the body.

**Hint**: Remember the term "decompression sickness" and its implications for divers.

### Final Answer:
A diver loses strength and feels drowsy after deep diving due to the formation of nitrogen bubbles in the bloodstream when they ascend too quickly from high pressure to low pressure. This condition is known as decompression sickness.