Changes

:::::'''Fig. 2.10   Collagen cross-links'''

:::::'''Fig. 2.10   Collagen cross-links'''

:::::Crosslinks in immature connective tissue pass between collagen molecules within a fibril (a).  The molecules are linked head to tail to form an infinite polymer.   

:::::Crosslinks in immature connective tissue pass between collagen molecules within a fibril (a).  The molecules are linked head to tail to form an infinite polymer.   

::::In a mature collagen fibre, (b), the crosslinks pass between the fibrils to link them in register.   

:::::In a mature collagen fibre, (b), the crosslinks pass between the fibrils to link them in register.   

:::::(Adapted from Bailey, 1988).  

:::::(Adapted from Bailey, 1988).  

[[File:QMSection2.11.png|thumb|'''Fig. 11 Tensile stress in collagen''']]

[[File:QMSection2.11.png|thumb|'''Fig. 11 Tensile stress in collagen''']]

::::'''Fig. 11 Tensile stress in collagen'''

:::::'''Fig. 11 Tensile stress in collagen'''

::::The stress–strain relationship in a bundle of collagen fibres, at a low rate of strain.   

:::::The stress–strain relationship in a bundle of collagen fibres, at a low rate of strain.   

::::Phase I:  Rapid elongation as the "crimp" in the collagen fibres is eliminated.  This part of the curve is smaller at the high strain rates likely to occur in vivo.   

:::::Phase I:  Rapid elongation as the "crimp" in the collagen fibres is eliminated.  This part of the curve is smaller at the high strain rates likely to occur in vivo.   

::::Phase II:  Stress is proportional to strain.  This elastic phase of collagen is the phase most useful in vivo.   

:::::Phase II:  Stress is proportional to strain.  This elastic phase of collagen is the phase most useful in vivo.   

::::Phase III:  Breakdown of the crystalline components of the collagen fibres.  Deformation takes place with progressively less stress.

:::::Phase III:  Breakdown of the crystalline components of the collagen fibres.  Deformation takes place with progressively less stress.