Bones are covered and lined by a protective tissue called periosteum. The inner

Biology
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Bones are covered and lined by a protective tissue called periosteum. The inner (osteogenic) layer consists primarily of ________.

A) cartilage and compact bone

B) dense irregular connective tissue

C) osteogenic cells

D) chondrocytes and osteocytes

Oct 14th, 2015

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Parts of Bones 

The long bones of the body contain numerous particular areas because of the route in which they create. During childbirth, each long bone is made of three individual bones isolated by hyaline ligament. Every end bone is called an epiphysis (epi = on; physis = to develop) while the center bone is known as a diaphysis (dia = going through). The epiphyses and diaphysis develop towards each other and in the long run wire into one bone. The locale of development and consequent combination in the middle of the epiphysis and diaphysis is known as the metaphysis (meta = after). When the long bone parts have melded, the main hyaline ligament left in the bone is found as articular ligament on the finishes of the bone that frame joints with different bones. The articular ligament goes about as a safeguard and floating surface between the unresolved issues development at the joint. 

Taking a gander at a bone in cross segment, there are a few unmistakable layered locales that make up a bone. The outside of a bone is secured in a slight layer of thick unpredictable connective tissue called the periosteum. The periosteum contains numerous solid collagen strands that are utilized to immovably grapple tendons and muscles deep down for development. Undifferentiated organisms and osteoblast cells in the periosteum are included in the development and repair of the bone's outside because of anxiety and harm. Veins present in the periosteum give vitality to the cells on the bone's surface and infiltrate into the bone itself to feed the cells within the bone. The periosteum additionally contains sensory tissue and numerous nerve endings to give bone its affectability to torment when harmed. 

Profound to the periosteum is the conservative bone that makes up the hard, mineralized bit of the bone. Reduced bone is made of a framework of hard mineral salts strengthened with extreme collagen strands. Numerous modest cells called osteocytes live in little spaces in the lattice and keep up the quality and trustworthiness of the minimal bone. 

Profound to the reduced bone layer is a district of elastic bone where the bone tissue develops in meager sections called trabeculae with spaces for red bone marrow in the middle. The trabeculae develop in a particular example to oppose outside hassles with minimal measure of mass conceivable, keeping bones light however solid. Long bones have a springy bone on their finishes however have an empty medullary cavity amidst the diaphysis. The medullary cavity contains red bone marrow amid youth, in the long run transforming into yellow bone marrow after adolescence.


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Oct 14th, 2015

the answer is c btw


Oct 14th, 2015

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