Skeletal System- Bone Deposition

Where are osteoclasts present?

Bone cavities.

What action is an osteoclast involved in?

Bone resorption.

How is bone deposition regulated?

By the amount of strain on the bone. More strain=more bone

What does osteoblasts move in an out of bone?

Calcium and phosphate.

Name the cells involved in bone deposition.

Osteoblasts, osteoclasts, and osteocytes.

During periods of rapid growth, osteoclasts help by:

Removing dead bone, preventing thickness and heaviness.

List the steps for osteoblasts to make bone.

1- they make the precursor of the protein collagen 2- they secrete an amorphous protein-polysaccharide ground substance. 3- collagen polymerizes to form collagen fibers, so the matrix becomes like leather. 4- inorganic calcium and phosphate salts are deposited into matrix, matrix hardens. Calcium combines with phosphates to produce calcium phosphate and them this is converted slowly over several weeks into hydroxyapatite.

Where are osteoblasts found?

In areas of bone growth, repair, and periosteum.

In order to counteract resorption, ____ keep working after the end of the growth period.

Osteoblasts.

What cells always comes behind osteoblasts?

Osteoclasts.

_____ contain many lysosomes that release digestive enzymes for the breakdown of collagen and splitting of salts.

Osteoclasts.

____ are mature bone cells.

Osteocytes.

____ may participate in bone resorption by helping release calcium from the matrix into the blood (helping to maintain homeostasis).

Osteocytes.