Главная > Реферат >Остальные работы
Bone Development Essay, Research Paper
2a) Functions of:
skeleton: To provide support and protection of body parts.It acts as sites for muscle attachment, blood cell production, and calcium and phosphate storage.
Cartilage: Serves as structural models for bones that replace them.It maintains the shape of the nose,outer ear, and other body parts.It also serves to cusion joints between adjacent bones of the vertebral column,limbs,hands, and elsewhere.
Ligaments: These bridge the gap between bones
Tendons: Cords or straps of connective tissue that attach muscle to bones
2b) Bone development and structure
development: New bone is formed by cells called osteoblasts, which secrete collagen fibres on which calcium is later deposited. Bone is laid down in thin concentric layers called lamellae, like so many layers of paint on an old pipe. The lamellae are laid down as series of tubes around narrow channels called haversian canals, which run parallel to the length of the bone. The haversian canals are interconnected and contain blood vessels and nerve cells. The blood vessels provide a life-line to living bone-forming cells, while the nerves control the diameter of the blood vessels, and thus, the flow through them. When bone is first formed in the embryo, osteoblasts use the cartilage skeleton as a template for bone formation. Later, new bone is formed along the stress lines.
Structure: bone is composed of two types of tissue; spongy bone tissue and compact bone tissue. Spongy bone tissue forms much of the body’s red blood cells, while compact bone tissue gives strength to withstand mechanical stress.
2c)Types of Joints
fibrous joints: Short connecting fibres which stitch bones together. These joints are responsible for holding teeth in their sockets.
Cartilaginous joints: joints in which cartilage holds bones together
Synovial joints:allow widest range of movement, and include :
Hinge joints:allow forearm and lower leg to swing back and forth
Saddle joints: one bone sits astride the other that’s shaped like a saddle
Angular joints: small bones of the wrist form a curved surface that sits into a flattened u-shaped cavity
Gliding joints: allow only limited movements such as the vertebra
Pivot joints: allow rotary movement
2) Understanding Biology
Author: Don Galbrith
Faculty of Education
University of Toronto
3) Understanding Biology
Peter H. Raven and George B. Johnson
Proffesor of Botany and Professor of Biology
- ... Policy and Law Paper No. 30. ... and consult each other, for ... socio-economic research as well ... been cooperating for the benefit of environment and the inhabitants of a developing ... generations. FormPlast, functioning under Vinoy?s ... environment. 2a Declare that ...
- ... Responses: Protestant: 1a, 2a, 3a, 4b, 5a, 6b ... religious movement that develops some unity and ... others. Working together, each in its own ... tradition–something that had been handed down. sola ... such exalted functions [those ecclesiastical functions of the ...
- ... PhD). Serotonin’s main functions are to control ... (serotonin) levels have been associated with clinical depression ... water they, “developed mild oedoma (abnormal ... serotonin receptor, called receptor 2A, which by itself ... . However, the research does present some ...
- ... BASICSIn our paper you will find ... telecommunication one : TELECOM 2A. Most of the ... with only organizing functions for the "Laender" ... interests a central (Bonn or Berlin based) ... guarantees e.g. that each state will accept ... households in less developed regions. One ...
- ... both by traditional, analytic, paper-and-pencil tests and ... cognitive styles assigned to each group. Each group will list ... the classroom. 2a. Very few research studies have been able to ... was found in the development of functional syllabuses, more popularly ...