Question

The inner cavities of bones are filled with _______________.

2. The hard, outside part of a bone is called _______________ tissue.

3. The spongy, inner tissue of a bone is called _______________ tissue.

4. Red blood cells are formed in the __________ marrow of bones.

5. The bones are operated by ______________ to produce body movements

Answer 1

The inner cavities of bones contain bone marrow. The hard exterior layer is compact bone tissue, while the lighter, porous interior is spongy bone tissue. Red blood cells are formed in the red marrow, and muscles move the bones.

Step-by-step explanation:

The inner cavities of bones are filled with bone marrow.

The hard, outside part of a bone is called compact bone tissue.

The spongy, inner tissue of a bone is called spongy bone tissue or cancellous bone.

Red blood cells are formed in the red marrow of bones.

The bones are operated by muscles to produce body movements.

Answer 2

The first one is marrow. The second one is Cortical bone, the third is Cancellous bone, the fourth is red, the fifth is muscles, and the sixth is periosteum.