|
Immovable Joints |
Movable Joints |
|
These are immovable joints and called surtures. |
These are freely movable joints. |
|
Bones are held together by dense fixed joints. |
Bones are not fused with bands of fibres. |
|
Has no fluid. Pubic symphysis, between canial bones. |
Has synovial fluid in synovial cavity. e.g. Shoulder and hip joint. |
Role of calcium in muscle contraction When the muscle fibre is depolarized then Sarcoplasmic Reticulum releases calcium ions which bind with specific site present on troponin component of actin filament. Increase in Ca++ level leads to the binding of calcium with a subunit of Troponin on actin filaments and thereby remove the masking of active sites for myosin. Utilising the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. Thus, sarcomere contracts .
|
|
Tendons |
Ligaments |
|
1. Structure : |
Made up of white fibrous connective tissue. |
Made up of yellow fibrous tissue. |
|
2. Arrangement of fibroblasts : |
In rows between the bundles of white fibres. |
Found scattered in matrix. |
|
3. Nature : |
Tough and inflexible. |
Elastic and flexible. |
|
4. Function : |
Join bones to muscles. |
Join bones together. |
Joints are the point of contact between bones or between bones and cartilages.
Role of joints in movement :
2. They help in locomotion and many other movements.
3. They help to connect a bone to a bone allowing movemnt.
Switch
