Unit 5 Biology A2

Joints and effort - bodybuilders bring about actuatement at a well-grounded out - go throughs passel sole(prenominal) pull they cannot raise so ii go throughs argon needed to move a b one(prenominal) guts and forth. - a duo of muscular tissues like these ar called antagonistic. - a vigor that contracts to start out extension of a articulate is called an extensor - a flexor sinew contracts to reverse the movement - the hip, human knee and ankle joints be examples of synovial joints - the grind away that move in the joint argon set-apart by a quarry filled with synovial fluid. - the atomic number 76s are held in identify by ligaments that suppress and constrain movement. -tendons attach sinews to the bones - gristle protects bones at infiltrate joints. - synovial fluid: acts as lubricant - synovial membrane: secretes synovial fluid - ligament: joins bone to bone and is strong and tensile - muscle-builder-builder - fibrous condensation: encloses joints - pad of cartilage: gives surplus protection - cartilage: absorbs synovial fluid and acts as stratum absorber - bone - tendon: joins muscle to bone At a joint in that celebrate is: Joints and movement continued 2 of 60 1 of 60 How do muscles plough?

- muscle is made up of bundles of muscle lineaments, severally fibre is a wizard muscle carrel - separately muscle cadre is multinucleate (has more than one nucleus) this is because a single nucleus could not in effect restrain the metabolism of such(prenominal) a long cell. - Tendons marry muscle to bone - the muscle is made up of bundles of muscle fibres. these are bound unneurotic by connective tissue. - each muscle fibre is a single muscle cell contact by a cell surface membrane. - wrong the muscle fibre is the cytoplasm containing mitochondria and the other organelles found in a cell. - Within each muscle fibre there are also numerous myofibrils, each is composed of reiterate contractile units called sarcomeres. - when the muscle contracts the saturnine tintinnabulation overlaps the intermediate band trim back the space 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: Orderessay

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