The blocking of capilaries due to sudden release of bubbles of `N_2` gas in blood is known as

Options

A. Bends
B. Blends
C. Mends
D. All of these

Answer

To solve the question, we need to identify the term that describes the blocking of capillaries due to the sudden release of bubbles of nitrogen gas (N₂) in the blood. This phenomenon is commonly associated with diving and rapid ascents.

### Step-by-Step Solution:

1. **Understanding the Context**:
- The question refers to a medical condition that occurs when nitrogen gas forms bubbles in the bloodstream, particularly after a diver ascends too quickly from deep water.

2. **Identifying the Condition**:
- When a diver is at great depths, the pressure is high, and nitrogen gas dissolves in the blood. If the diver ascends too quickly, the pressure decreases rapidly, leading to the formation of nitrogen bubbles in the blood.

3. **Recognizing the Medical Term**:
- The condition caused by these nitrogen bubbles blocking blood vessels (capillaries) is known as "the bends." This term is derived from the severe joint pain that can occur as a result of the bubbles.

4. **Eliminating Incorrect Options**:
- The other options mentioned, such as "blends" and "mends," do not relate to the medical condition described in the question.
- "Blends" refers to mixing substances, while "mends" refers to repairing something.

5. **Final Answer**:
- Therefore, the correct answer to the question is that the blocking of capillaries due to the sudden release of bubbles of N₂ gas in blood is known as **the bends**.