38.2 Bone

It has a matrix of minerals and fibers.

The minerals in the mineral salts are formed from calciumphosphate.

The process of calcification only happens in the presence of collagen fibers.

Long bones, short bones, flat bones, sutural bones, sesamoid bones, and irregular bones are the bones of the human skeleton.

There are different types of bones in the picture.

The bones of the limbs are long.

The bones of the wrist and ankle are exceptions to this.

The long bone is covered by articular cartilage at either end and contains bone marrow.

The wrist and ankle are short bones.

The roof of the skull is one of the examples of flat bones.

These bones are short, flat, or ridged.

Several bones skull are examples of irregular bones.

The patellae arSesamoid bones can be found near joints at the knees, hands, and feet.

A sesamoid bone is a part of the knee.

They may be between the skull's flat bones.

They are different in number, shape, size, and position.

There are various types of tissue in bones, which are considered to be organs.

The mineral matrix of bones is formed by living cells of bone tissue.
There are two types of bone tissue.

It protects and strengthens bones.

There are units called osteons or Haversian systems in compact bone tissue.

The long axis of the bone is parallel to them.

The alignment of the ostens in bone tissue helps it resist bending or fracturing.
There are areas of bone where stresses are applied in a few directions.

The bone's blood vessels and nerve fibers are contained in the Haversian canal, which is aligned parallel to the long axis of the bone.

The living osteocytes are represented by the small dark ovals in the osteon.

The cylindrical osteons are aligned so that they travel the length of the bone.

Spongy bone tissue does not contain osteons.

There is red bone marrow between the trabuculae.
This tissue has blood vessels that deliver blood to osteocytes.

Spongy bone causes the ends of long bones to compress as a result of the stresses applied to the bone.

Spongy bone is found in areas of bones that are not heavily stressed.

The neck of the femur is one of the bones that are subject to stress.

A framed picture on the floor.
If the toothpick was on the floor, you could hold up one side of the picture.
Attach the toothpick to the wall by drilling a hole.
The function of the toothpick is to send the downward pressure of the picture to the wall.
The picture is pulled down to the floor by the picture wire and the toothpick is pushed up by the hole in the wall.
The toothpick will fall at the wall.

The toothpick is in the wall, but the neck of the femur is horizontal.

The weight of the body pushes it down near the joint, but the vertical diaphysis of the femur pushes it up at the other end.
To transfer the downward force of the body weight to the vertical shaft of the femur, the neck of the femur needs to be strong.

There is tension on one side of the bone and compression on the other side.

You can use the link to learn about the micrographs of the musculoskeletal tissues.

The four types of cells in the bone are osteoblasts, osteoclasts, osteocytes and osteoprogenitor cells.

The organic part and the inorganic part of the matrix of bone tissue are created by osteoblasts.
The less active osteocytes become trapped in the secretions.
They remove bone structure by releasing lysosomal enzymes and acids.
Calcium concentrations in body fluids are regulated by the release of minerals from bones.
If the applied stresses have changed, bone may be used for remodeling.
The mineral salts in the bone matrix are recycled by the osteocytes.
In the repair of broken bones, osteoprogenitor cells are important.

The process of ossification is different from the process of calcification, which can occur in other tissues.

After six weeks after fertilization, ossification begins.
Before this time, the embryo's skeleton was made up of only the hyaline and fibrous membranes.
Intramembranous ossification is the process of developing bone from the hyaline cartilage.
The growth of the bones continues until the age of 25. ossification functions primarily in bone remodeling and repair after 25 years of age.

It is involved in the creation of the skull, the mandible, and the clavicles.

Mesenchymal cells form a template of the future bone.
At the ossification center, they differentiate into osteoblasts.
The matrix is hardened by calcium deposited by osteoblasts.
The non-mineralized portion of the bone continues to form around the blood vessels.
Fetal red bone marrow is created by connectingive tissue in the matrix.
A thin layer of bone is created on the surface of the spongy bone.

The bones of the body are formed through a process called ossification.

There is a template of the hyaline cartilage diaphysis in long bones.

The matrix responds to complex signals.
The opening up of cavities in the diaphysis cartilage can be caused by this calcification.
osteoblasts and osteoclasts modify the calcified cartilage matrix into spongy bone when blood vessels invade the cavities.
The marrow, or medullary, cavity in the center of the diaphysis is created when osteoclasts break down some of the bone.
There is a sheath around the bones.
The bone is attached to the surrounding tissues by the periosteum.
As the cells at the epiphyses divide, the bone continues to grow.

The centers of the epiphyses begin to break down in the last stage of bone development.

Blood vessels and osteoblasts enter the epiphyses to form secondary ossification centers.

The process of bone development from hyaline cartilage is called endochondral ossification.

The periosteum is the tissue on the outside of the bone that acts as an interface between bones and other body parts.

The addition of bone tissue at the epiphyseal plate prolongs the lifespan of long bones.

Through appositional growth, they increase in width.

One cell remains undifferentiated near the epiphysis and one cell moves toward the diaphysis on the epiphyseal side of the plate divide.

The cells are pushed from the epiphysis and destroyed.

The process of replacing cartilage with bone on the diaphyseal side of the plate results in a lengthening of the bone.

The age at which long bones stop growing is 18 for females and 21 for males.

All of the cartilage is replaced by bone during this process.
A structure called the epiphyseal line or epiphyseal remnant is left after the epiphyseal plate fades.

The inner surface of the bone is broken down by osteoclasts.

The osteocytes are the osteoblasts.
A balance between the two processes allows the bone to be thick.

After birth, bone renewal continues into adulthood.

The processes of bone deposition and bone resorption are involved.
Normal bone growth requires vitamins D, C, and A.
Proper bone growth and maintenance requires the use of hormones such as parathyroid hormone, growth hormone, and calcitonin.

Five to seven percent of bone mass is recycled every week.

Different areas of the skeleton and a different area of a bone have different turnover rates.
The bone in the head of the femur may be fully replaced every six months, whereas the bone along the shaft may be altered much more slowly.

When bones are subjected to stress, they become thicker and stronger.

When a limb is in a cast, bones that are not subject to normal stress will begin to lose mass.
A broken bone undergoes repair in four stages.
Blood vessels in the broken bone tear and hemorrhage, resulting in the formation of clotted blood, or a hematoma, at the site of the break.
The blood vessels at the broken ends of the bone are sealed off by the clotting process, which causes bone cells to die.

Within days of the injury, the capillaries grow into the hematoma and the phagocytic cells clear the dead cells.

fibroblasts and osteoblasts enter the area and begin to reform bone after fragments of the blood clot remain.

The broken bone ends are connected by fibroblasts and osteoblasts.

The fibrocartilaginous callus is composed of both hyaline and fibrocartilage and is the repair tissue between the broken bone ends.
There may be bone spicules at this point.

The fibrocartilaginous callus is turned into a bone.

It takes about two months for the ends of the broken bone to be joined together.
The formation of bone is similar to the ossification of the cartilage, with osteoblasts, osteoclasts, and bone matrix present.

Excess material on the exterior of the bone is removed in order to remodel the callus.

The bone tissue is similar to the original bone.
The bone may not be uniform for many years as a result of this remodeling.

The callus will knit the ends together after the bone is set.

There is a literature search on the role of calcium and collagen in maintaining bone structure.

There are diseases in which the bone structure is compromised.

Predicting the flexibility, strength, and mass of bones that have had the calcium and collagen components removed is a hypothesis.

There was an attempt to add calcium to the bones.

Put chicken bones in a jar of vinegar for seven days to test the prediction.

The chicken bones should be placed into a jar of water with calcium supplements added.
If you want to test the prediction, bake the bones for three hours.

The changes in bone flexibility, strength, and mass can be seen in a table.