The matrix of bone is in the form of thin concentric rings, called ______ Bone cells, called ______ are present in fluid-filled spaces called ______ . These fluid filled spaces of the bone communicate with each other by network of fine canals, called ______ .
Select the correct sequence of words to complete the above passage.

Options

A. Lacunae, Osteoblasts, Lamellae, Canaliculi
B. Lamellae, Osteocytes, Lacunae, Canaliculi
C. Lamellae, Chondrocytes, Canaliculi, Lacunae
D. Lacunae, Adipocytes, Canaliculi, Sarcoplasm

Answer

To complete the passage correctly, we need to fill in the blanks with the appropriate terms related to bone structure. Here’s the step-by-step solution:

1. **Identify the first blank**: The matrix of bone is in the form of thin concentric rings. The correct term for these rings is **lamellae**.
- **Hint**: Think about the structure of bone and what describes its layered arrangement.

2. **Identify the second blank**: The bone cells are present in these rings. The correct term for these bone cells is **osteocytes**.
- **Hint**: Recall the specific type of cells that are responsible for maintaining bone tissue.

3. **Identify the third blank**: The fluid-filled spaces where osteocytes are located are called **lacunae**.
- **Hint**: Consider where bone cells reside within the bone matrix.

4. **Identify the fourth blank**: The fluid-filled spaces of the bone communicate with each other through a network of fine canals known as **canaliculi**.
- **Hint**: Think about how nutrients and signals might travel between bone cells.

Now, putting it all together, the completed passage reads:

"The matrix of bone is in the form of thin concentric rings, called **lamellae**. Bone cells, called **osteocytes**, are present in fluid-filled spaces called **lacunae**. These fluid-filled spaces of the bone communicate with each other by a network of fine canals, called **canaliculi**."

### Summary of the Correct Sequence:
1. Lamellae
2. Osteocytes
3. Lacunae
4. Canaliculi