Which nematoblasts coil around the prey?

Options

A. Penetrants
B. Volvents
C. Small glutinants
D. Large glutinants.

Answer

To answer the question "Which nematoblasts coil around the prey?", we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Nematoblasts**:
Nematoblasts, also known as cnidocytes, are specialized cells found in cnidarians (like jellyfish and sea anemones) that contain stinging structures called nematocysts. These cells play a crucial role in capturing prey.

**Hint**: Remember that nematoblasts are specialized cells that help in prey capture.

2. **Analyzing the Options**:
- **Option 1: Penetrant**:
This type of nematoblast is known for injecting toxins into the prey. The thread tube opens and discharges a toxin that paralyzes the prey, but it does not coil around it.

**Hint**: Focus on the function of penetrant nematoblasts; they inject toxins rather than coil.

- **Option 2: Volvent**:
This is the correct option. Volvent nematoblasts have a thread tube that discharges and coils tightly around the prey, effectively holding it in place.

**Hint**: Volvent nematoblasts are characterized by their ability to coil around the prey.

- **Option 3: Small Glutinant**:
These nematoblasts discharge their thread straight and do not coil around the prey. They are not designed for holding prey in place.

**Hint**: Small glutinant nematoblasts do not coil; they have a different mechanism.

- **Option 4: Large Glutinant**:
Similar to small glutinants, these also do not coil around the prey. They have spines and are not effective for coiling.

**Hint**: Large glutinant nematoblasts also lack the coiling feature.

3. **Conclusion**:
After analyzing all the options, it is clear that the nematoblast that coils around the prey is **Option 2: Volvent**.

### Final Answer:
The nematoblasts that coil around the prey are **Volvent**.