Which of the following cytoskeletal elements involved in amoeboid movement? 

Options

A. Microfilaments
B. Microtubules
C. Myofibrils
D. B and C

Explanation

To solve the question regarding which cytoskeletal elements are involved in amoeboid movement, we can follow these steps:

### Step 1: Understand Amoeboid Movement
Amoeboid movement is a type of movement observed in amoebas and some other cells, characterized by the extension and retraction of cytoplasmic projections called pseudopodia.

### Step 2: Identify Cytoskeletal Elements
Cytoskeletal elements include microfilaments, microtubules, and intermediate filaments. Each of these has different roles in cellular structure and movement.

### Step 3: Analyze Each Option
1. **Microfilaments**: These are composed of actin and are crucial for amoeboid movement. They allow the cell to extend and retract its pseudopodia.

2. **Microtubules**: These are made of tubulin and primarily provide structural support to the cell. They are not directly involved in amoeboid movement.

3. **Myofibrils**: These are not a cytoskeletal element but rather the contractile units of muscle cells, composed of actin and myosin. They are not involved in amoeboid movement.

4. **B and C**: Since both microtubules and myofibrils do not contribute to amoeboid movement, this option is incorrect.

### Step 4: Conclusion
The only cytoskeletal element involved in amoeboid movement is **microfilaments**.

### Final Answer
**Microfilaments** are the cytoskeletal elements involved in amoeboid movement.

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