Question

1. Bone is covered on its external surface by:

1. Periosteum.
2. Perichondrium.
3. Endosteum.
4. None of the above is true.

2. Endosteum:

1. Is present on the internal surface of bones.
2. Is a thick cellular layer.
3. Possesses Osteogenic capabilities.
4. All of the above are true.
5. Only a + c are true.

3. Osteoblasts:

1. Have a rounded face adjacent to the bony surface.
2. Their Cytoplasm contains abundant Rough Endoplasmic Reticulum.
3. Are Protein secretory cells.
4. All of the above are true.
5. Only b + c are true.

Answer 1

1. Option a is the correct answer.

The external outer thick covering of bone is known as periosteum.

2. Option e is the correct answer.

Endosteum is present on the internal surface around medullary cavity. It is a thin layer of connective tissue containing endosteal cells. These endosteal cells have osteogenic capabilities and thus play a role in bone formation.

3. Option e is the correct answer.

Osteoblast cells are cuboidal or low columnar in shape. In an active osteoblast cell have abundant granules of rough endoplasmic reticulum. All the bone cells including osteoblasts are protein secretory cells and secret protein in order to bone growth and repair.