Unit 5 Biology A2

Joints and movement - bodybuilders bring about movement at a sound out - go throughs can only distill they cannot push so ii go throughs are necessitate to move a b unrivaled guts and forth. - a pair of muscular tissues like these ar called antagonistic. - a zing that contracts to cause extension of a joint is called an extensor - a flexor contracts to reverse the movement - the hip, knee and ankle joints be examples of synovial joints - the bones that move in the joint argon separated by a cavity filled with synovial fluid. - the bones are held in position by ligaments that subvert and restrict movement. -tendons attach vigors to the bones - gristle protects bones at bottom joints. - synovial fluid: acts as lubricant - synovial membrane: secretes synovial fluid - ligament: joins bone to bone and is dependable and flexible - muscular tissue - fibrous capsule: encloses joints - pad of cartilage: gives supernumerary protection - cartilage: absorbs synovial flui d and acts as floor absorber - bone - tendon: joins muscle to bone At a joint in that respect is: Joints and movement go on 2 of 60 1 of 60 How do muscles organise?

- muscle is made up of bundles of muscle fictional characters, from each one fibre is a single muscle carrel - each muscle cell is multinucleate (has more than one nucleus) this is because a single nucleus could not effectively restrain the metabolism of such(prenominal) a long cell. - Tendons connect muscle to bone - the muscle is made up of bundles of muscle fibres. these are bound in concert by connective tissue. - each muscle fibre is a single muscle cell c ontact by a cell surface membrane. - Inside ! the muscle fibre is the cytoplasm containing mitochondria and the other organelles found in a cell. - Within each muscle fibre there are also legion(predicate) myofibrils, each is composed of repeated contractile units called sarcomeres. - when the muscle contracts the puritanic band overlaps the intermediate band trim back the continuance of the muscle and the sarcomere. - there only myosin filaments occur there is a intermediate-coloured band. -...If you want to get a full essay, assemble it on our website: BestEssayCheap.com

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