Kinesiology: JOINT-STRUCTURE-AND-FUNCTION-ppt

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108 Terms

1

Joint

It connects two or more components of a structure.

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2

Connective tissue

It is a type of tissue that provides support and connects different parts of the body.

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3

Extracellular matrix

It is a complex network of proteins and other molecules that surrounds cells in connective tissue.

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4

Collagen

It is the most abundant protein in the human body and is a major component of the extracellular matrix.

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5

Fibroblast

These are cells that produce the extracellular matrix in connective tissue.

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6

Chondrocyte

These are cells found in cartilage that produce and maintain the extracellular matrix.

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7

Osteocyte

These are mature bone cells that maintain the extracellular matrix of bone tissue.

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8

Elastin

It is a protein that provides elasticity to tissues, such as skin and blood vessels.

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9

Glycosaminoglycans (GAG)

These are long chains of repeating disaccharide units that are attached to proteins in the extracellular matrix.

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10

Ligament

Bands of connective tissue that connect bones to other bones, providing stability to joints.

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11

Ligaments

Connective tissues that attach bone to bone.

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12

Tendons

Connective tissues that attach muscle to bone.

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13

Enthesis

The point of attachment of ligaments and tendons to bone.

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14

Fibrocartilage

Cartilage that forms the attachment between tendons/ligaments and bone.

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15

Fibrous attachment

Attachment of tendons/ligaments to bone where collagen fibers blend into the periosteum of the bone.

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16

Sharpey's fibers

Fibers that attach the periosteum of the bone to the underlying cortical bone.

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17

Endotendon

Groups of tendon fibers enclosed by a loose connective tissue sheath.

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18

Peritendon

The combination of epitenon and paratenon.

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19

Tenosynovium

A synovium-filled sheath that can form around the peritendon in areas of high friction.

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20

Elastic cartilage

Cartilage that contains more elastin and is found in ears and the epiglottis.

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21

Hyaline cartilage

Cartilage that forms a thin covering at the ends of bones in synovial joints and provides a smooth, low friction surface.

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22

Articular cartilage

Another term for hyaline cartilage.

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23

Tidemark

The boundary between calcified and uncalcified parts of the enthesis.

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24

Myotendinous junction

The attachment of a tendon to muscle.

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25

Endochondral ossification

The replacement of the calcified layer of articular cartilage with bone.

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26

Chondrocytes

The cells found in cartilage.

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27

Osmotic swelling pressure

The pressure created by the attraction of water to proteoglycans in cartilage.

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28

Equilibrium

The balance between swelling pressure and load on the joint, which stops deformation of cartilage.

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29

Synovial fluid

The fluid that nourishes chondrocytes in hyaline cartilage.

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30

Extracellular matrix

The non-cellular component of cartilage that contains collagen fibers, proteoglycans, and water.

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31

Degeneration

The breakdown or deterioration of cartilage, which can lead to conditions like osteoarthritis.

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32

Bone

The hardest connective tissue in the body, composed of organic material for flexibility and tensile strength, and inorganic material for compressive strength.

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33

Fibroblasts

Bone cells that produce type 1 collagen and other extracellular matrix components.

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34

Osteoblasts

The primary bone forming cells responsible for synthesis of bone and deposition and mineralization.

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35

Osteoclasts

Bone cells responsible for bone resorption.

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36

Compact bone

The outer dense layer of bone.

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37

Cancellous bone

The inner spongy bone with thin plates called trabeculae.

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38

Periosteum

The fibrous layer that covers the entire surface of the bone except the articular surface.

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39

Woven bone

Young bone with irregularly arranged collagen fibers.

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40

Lamellar bone

Adult bone with an organized extracellular matrix framework.

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41

Wolff's Law

The change in bone shape to match function in response to new forces.

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42

Osteoporosis

A condition where there is an imbalance between bone synthesis and resorption, resulting in decreased bone mineral density and increased susceptibility to fracture.

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43

Isotropic materials

Materials that display the same mechanical behavior regardless of the direction of applied forces.

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44

Anisotropic materials

Heterogeneous connective tissues that behave differently depending on the size and direction of applied forces.

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45

SAID principle

The ability of connective tissues to respond to load alterations.

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46

Load

The force applied to a structure.

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47

Deformation

The change in shape or size of a structure due to applied forces.

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48

Elasticity

The ability of a material to return to its original shape after deformation.

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49

Plasticity

The ability of a material to undergo permanent deformation without breaking.

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50

Ultimate strength

The maximum load a material can withstand before failure.

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51

Stiffness

The resistance of a material to deformation under applied forces.

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52

Stress

The force per unit area of a material.

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53

Strain

The percentage change in length or cross section of a structure or material.

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54

Ultimate stress

The stress just before a material fails.

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55

Ultimate strain

The strain at the point of failure.

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56

Tensile stress

Stress caused by forces pulling in opposite directions, resulting in elongation.

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57

Tensile strain

Strain caused by elongation of a structure or material.

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58

Compressive stress

Stress caused by forces pushing towards each other, resulting in compression.

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59

Compressive strain

Strain caused by compression of a structure or material.

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60

Shear loading

Forces applied parallel to each other but in opposite directions, resulting in shear stress and strain.

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61

Torsional loading

Forces applied perpendicular to the long axis of a structure, resulting in torsional stress.

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62

Bending forces

Forces applied to a structure that create both tensile and compressive stress and strain.

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63

Stress-strain curve

A graphical representation that shows the relationship between stress (force per unit area) and strain (deformation) of a material. It is used to compare the strength properties of different materials or to compare the same tissue under different conditions.

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64

Elastic materials

Materials that can deform under stress but return to their original shape when the stress is removed. The stress-strain curve for these materials is flatter.

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65

Stiff materials

Materials that have a high resistance to deformation under stress. The stress-strain curve for these materials is steeper.

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66

Brittle material

A material that is strong but has little strain for a high stress. It fractures suddenly with little or no plastic deformation.

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67

Ductile material

A material that can undergo plastic deformation after the elastic region. It has a section where "necking" occurs, which is a permanent deformation.

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68

Plastic material

A material that has a very small elastic region and undergoes permanent deformation in the plastic region.

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69

Young's modulus

Also known as the modulus of elasticity, it is a measure of a material's stiffness or resistance to external loads. It is represented by the slope of the linear portion of the stress-strain curve.

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70

Load deformation curve

Each material has its own stress and strain curve, which represents its unique behavior under load and deformation.

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71

Toe region

The first region of the stress-strain curve where very little force is required to deform the tissue. It is characterized by minimal stress and large deformation.

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72

Elastic region

The second portion of the stress-strain curve where elongation has a linear relationship with stress. Additional force creates an equal stress and strain in the tissue.

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73

Plastic region

The third region of the stress-strain curve where the failure of collagen fibers begins. The tissue no longer returns to its original length after the force is removed.

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74

Rupture

Failure that occurs in the middle of the structure through disruption of connective tissue fibers.

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75

Avulsion

Failure that occurs at the bony attachment of the ligament or tendon.

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76

Fracture

Failure that occurs within the bony tissue.

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77

Viscoelasticity

The property of a material that exhibits both elastic and viscous behavior. It is influenced by factors such as collagen and elastin content, length change, and applied load.

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78

Viscosity

A material's resistance to flow. It reduces as the temperature increases or with slow loading, and increases with pressure or rapid loading.

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79

Creep

A time-dependent deformation that occurs under a constant load and length change.

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80

Stress relaxation

When a tissue is stretched to a fixed length and held there, the force needed to maintain this length decreases with time.

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81

Hysteresis

The energy dissipated by elongation and the heat released during loading and unloading of a material.

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82

Strain rate sensitivity

The sensitivity of a material's response to the rate at which it is strained. Fast strain rates result in low strain, while slow strain rates result in high strain.

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83

Cortical bone

A type of bone that is stiffer than cancellous bone. It resists compressive stress more than tensile stress.

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84

Cancellous bone

A type of bone that is less stiff than cortical bone. It has a higher percentage of void spaces and is more resistant to compressive stress.

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85

Tendons

Connective tissues that connect muscles to bones. They exhibit creep when subjected to tensile loading.

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86

Ligaments

Connective tissues that connect bones to other bones. They can withstand forces in all directions without being damaged but are less resistant to tensile stress.

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87

Cartilage

A type of connective tissue that forms the smooth surface of joints. It resists applied load and experiences swelling pressure and friction due to fluid flow.

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88

Compression

The reduction in volume of cartilage that increases pressure and causes fluid to flow out.

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89

Frictional resistance

The resistance to fluid flow within tissues caused by fluid flow through the extracellular matrix.

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90

Hoop stresses

Stresses created when compressed proteoglycans and water push against collagen fibers in cartilage.

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91

Toe region

The region in cartilage, ligaments, and tendons where frictional drag or straightening of collagen fibers occurs.

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92

Shear stress

Stress that develops between the calcified layer and subchondral bone in cartilage.

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93

Joint capsule

The structure that surrounds a joint and provides stability.

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94

Synovial fluid

Fluid that covers the inner layer of the joint capsule and articular cartilage, lubricates the joint, reduces friction, and nourishes the cartilage.

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95

Viscosity

The resistance of a substance to shear load, which can be affected by factors such as rate of movement and temperature.

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96

Lubrication

The process of reducing friction between joint surfaces.

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97

Hydrostatic lubrication

Lubrication where load-bearing surfaces are held apart by a film of lubricant maintained under pressure.

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98

Hydrodynamic lubrication

Lubrication where a wedge of fluid is created when non-parallel opposing forces slide on each other.

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99

Squeeze film lubrication

Lubrication where pressure is created in the fluid film by the movement of articular surfaces that are perpendicular to each other.

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100

Elastohydrodynamic lubrication

Lubrication where the fluid film is maintained at a certain thickness as the elastic cartilage deforms slightly to maintain an adequate layer of fluid between the joint surfaces.

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