Compact Bone - Homeostasis Of Bone Tissue

Front 1

Osteons in compact bone are situated how? What is their function?

Back 1

Osteons run longitudinally with the axis of the bone, functioning as weight-bearing pillars, resisting compression.

Front 2

Spongy bone is also composed of osteocytes and extracellular matrix, but the bone cells...

Back 2

Do not form clusters around the central canal like compact bone, instead they lie in trabeculae and get nutrients from substances diffusing into the canaliculi.

Front 3

Endochondral bones replace

Back 3

Bones that begin as masses of hyaline cartilage

Front 4

Osteoblasts vs osteoclasts

Back 4

Osteoblasts = build

Osteoclasts = breakdown

Front 5

Osteoblasts and osteoclasts are ________.

Back 5

Always breaking down bones.

Front 6

Endochondral bones vs intramembranous bones

Back 6

Endochondral bones = cartilage

Intramembranous bones = sheet-like.

Front 7

Extra blood calcium leads to _____ which leads to _______.

Back 7

Extra blood calcium leads to calcification which leads to increased bone calcium.

Front 8

Low blood calcium leads to ____ which leads to _____.

Back 8

Low blood calcium leads to parathyroid hormone (PTH) which leads to decreased bone calcium.

Front 9

Which is more important: blood calcium or bone calcium?

Back 9

Blood calcium.

Front 10

Which bones have styloid processes?

Back 10

- look up in book -

Front 11

Most bones of the skeleton are _____ bones that develop from ____.

Back 11

Endochondral bones, that develop from masses of hyaline cartilage.

Front 12

Once completely surrounded by the bony matrix, osteoblasts are called...

Back 12

Osteocytes.

Front 13

Epiphyseal plate (growth plate) is made of? Is found?

Back 13

Hyaline cartilage; in the metaphysis at the end of each long bone.

Front 14

Zone of resting cartilage

Back 14

the first layer, it anchors the epiphyseal plate to the epiphysis; composed of resting cells that do not actively participate in growth.

Front 15

Zone of proliferating cartilage

Back 15

Second layer of the epiphyseal plate; includes rows of many young cells undergoing mitosis.

Front 16

Zone of hypertrophic cartilage

Back 16

The third layer; the row of older cells that are left when new cells appear form this layer. It enlarges and thickens the epiphyseal plate.

Front 17

Zone of calcified cartilage

Back 17

The fourth layer; it is thin, made of dead cartilage cells and calcified extracellular matrix

Front 18

Bone remodeling

Back 18

Performed throughout life by osteoclasts resorbing bone tissue and osteoblasts replacing the bone.

Front 19

Resorption and Deposition

Back 19

osteoclasts perform resorption, and osteoblasts perform deposition during bone remodeling; occurs on the surface of the endosteum and periosteum.

Front 20

Endochondral ossification

Back 20

The process of forming endochondral bone by replacing hyaline cartilage

Front 21

Primary ossification center

Back 21

In a long bone, bone tissue begins to replace hyaline cartilage in the center of the diaphysis

Front 22

Secondary ossification centers

Back 22

Appear in the epiphyses and spongy bone forms in all directions from them.