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MUSCULOSKELETAL SYSTEM (MUSCLE CONTRACTION PROCESS (((8. Tropomyosin…
MUSCULOSKELETAL SYSTEM
BONE
HEALING
1.
Hematoma formation
2.
Bone generation
3.
Bony callous formation
4.
Bone remodelling
FORMATION
(OSSIFICATION)
Endochondrial
Intramembraneous
GROWTH
SKELETAL MUSCLE
CHARACTER-ISTICS
ELASTICITY
ability to respond/contract in response of chemical/electrical signals
EXCITABILITY
capacity to stretch to normal resting length after contraction
CONTRACTILITY
ability to shorten causes movement of structure on attached muscles
EXTENSIBILITY
ability to return to normal resting length after stretch
TYPES OF JOINTS
Cartillaginous
(partially movable)
Synchodroses
eg: 1st rib meets sternum
Symphyses
eg: pubic symphysis
Synovial, diathrosis
(Freely movable)
Ball and socket eg: hip joint
Pivot eg: C1
Hinge eg: elbow
Plane eg: between tarsal bone
Saddle eg: 1st metacarpal bone
Condyloid eg: between radius and carpal bone of wrist
Fibrous
(Immovable)
Syndesmoses
eg: radioulnar joint
Gomphoses
eg: binds teeth to bony teeth
Sutures
eg: suture on skull
MUSCLE
CONTRACTION
PROCESS
3.
ACh binds -> receptor -> motor plate end
4.
Na+ influx into muscle fibers
2.
ACh released
5.
Action potential triggers T tubules
6.
Sarcoplasmic reticulum releases Ca+
1.
Neuron action potential arrives -> motor end
7.
Ca+ binds to troponin
8.
Tropomyosin shift -> myosin binding site expose
9.
Myosin binds to actin
10.
Myosin pivots -> actin filament pulled
11.
Myosin released from actin
12.
Myosin in ready position