They have low calcium content. They contain a yellow bone marrow in the bone marrow cavity. Their bone marrows store fat. Their bone marrows produce red blood cells and white blood cells. They are found in long bone tissues such as in the arms and legs.
They are found mostly in short bones such as those in the wrist and ankles. They are designed to withstand heavy weight. They are not designed to buffer the shock produced from any movement. They do not transform into spongy bones. The action of osteoblasts deposits a new bone matrix between trabeculae and eventually transforms spongy bones to compact bones. Some interesting similarities between Compact and Spongy Bones are given below. They are the bone tissues in animals that provide shape and support to the body.
Both types of bones contain osteoblasts and osteoclasts that are necessary for creating bones. Both compact and spongy bones contain proteins like collagens and osteoids, which mineralize to help in bone formation.
There are inorganic mineral salts deposited in the matrix of both spongy and compact bones. There are blood vessels, nerves, and bone marrow within the lamella of both types of bones. Spongy Bone: Spongy bone is the osseous tissue, which fills the interior cavity of bones, consisting of mineralized bars called trabeculae. Compact Bone: Compact bones are also called cortical bones. Spongy Bone: Spongy bones are also called cancellous or trabecular bones.
Compact Bone: Compact bones are made up of osteons. Spongy Bone: Spongy bones are made up of trabeculae. Compact Bone: Compact bones do not have spaces between lamellae. Spongy Bone: Spongy bones consist of spaces between lamellae. Compact Bone: Compact bone has a marrow cavity. Spongy Bone: Spongy bone does not have a marrow cavity.
Compact Bone: There is a high amount of Calcium in compact bones. Spongy Bone: There is a very low amount of Calcium in spongy bones. Compact Bone: Compact bones are cylindrical. Compact Bone: Compact bones contain yellow bone marrow. Spongy Bone: Spongy bones contain red bone marrow. Compact Bone: Compact bones form major parts of the long bones such as arms and legs.
Spongy Bone: Spongy bones form major parts of the short bones such as wrists and ankles. Spongy Bone: Spongy bones are softer and more porous. Compact Bone: Compact bones occur in the inner surface of a bone.
Spongy Bone: Spongy bones occur in the outer layers of a bone. Compact Bone: Compact bones can withstand the weight of up to pounds. Spongy Bone: Spongy bones are unable to withstand high weights. Compact Bone: Compact bones provide structural support to the body. Spongy Bone: Spongy bones act as a buffer for compact bones. Compact bone and spongy bone are the two types of bones that occur in animals.
Compact bones are made up of osteons. They are hard and contain high amounts of minerals. Spongy bones are made up of trabeculae. They are softer and contain a lot of spaces in the bone. Compact bones occur in the outer surface of the long bones and spongy bones occur in the middle of the long bones.
Spongy bone is prominent in areas of bones that are not heavily stressed or where stresses arrive from many directions. The epiphyses of bones, such as the neck of the femur, are subject to stress from many directions. Imagine laying a heavy framed picture flat on the floor.
You could hold up one side of the picture with a toothpick if the toothpick was perpendicular to the floor and the picture. Now drill a hole and stick the toothpick into the wall to hang up the picture. In this case, the function of the toothpick is to transmit the downward pressure of the picture to the wall. The force on the picture is straight down to the floor, but the force on the toothpick is both the picture wire pulling down and the bottom of the hole in the wall pushing up.
The toothpick will break off right at the wall. The neck of the femur is horizontal like the toothpick in the wall. 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.
The neck of the femur must be strong enough to transfer the downward force of the body weight horizontally to the vertical shaft of the femur Figure 2. Bone consists of four types of cells: osteoblasts, osteoclasts, osteocytes, and osteoprogenitor cells. Osteoblasts are bone cells that are responsible for bone formation.
Osteoblasts synthesize and secrete the organic part and inorganic part of the extracellular matrix of bone tissue, and collagen fibers. Osteoblasts become trapped in these secretions and differentiate into less active osteocytes. Osteoclasts are large bone cells with up to 50 nuclei.
They remove bone structure by releasing lysosomal enzymes and acids that dissolve the bony matrix. These minerals, released from bones into the blood, help regulate calcium concentrations in body fluids. Bone may also be resorbed for remodeling, if the applied stresses have changed.
Osteocytes are mature bone cells and are the main cells in bony connective tissue; these cells cannot divide. Osteocytes maintain normal bone structure by recycling the mineral salts in the bony matrix. Osteoprogenitor cells are squamous stem cells that divide to produce daughter cells that differentiate into osteoblasts.
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