topic 11 cont’d
DESCRIPTION
Topic 11 cont’d. Muscles and Movement. Roles of ________ in human movement. Bones – provide anchorage for muscles; act as levers to change the size and direction of forces Ligaments – connective tissue; connect bone to bone; allow certain movements and prevent others (dislocations) - PowerPoint PPT PresentationTRANSCRIPT
Topic 11 cont’dMuscles and Movement
Roles of ________ in human movement• Bones – provide anchorage for muscles; act as levers to
change the size and direction of forces
• Ligaments – connective tissue; connect bone to bone; allow certain movements and prevent others (dislocations)
• Muscles – attach to bone and provide the force necessary to change the position of the bones and therefore the body
– Only work when contracting = antagonistic pairs
Cont’d
• Tendons – connective tissue that connects muscle to bone; transmit the forces generated by the contraction of muscle
• Nerves – innervate voluntary and involuntary muscles and are the cause of all muscle contraction
Elbow Joint
Label the human elbow joint
Structure and function• Bicep – flexes the joint• Tricep – extends the joint• Humerus – attachment point for the triceps and
biceps• Ulna – bone to which the triceps is attached• Radius – bone to which the bicep is attached• Cartilage – covers the bones, prevents friction• Synovial fluid – lubricates joint; prevents friction• Joint capsule – seals the joint; helps prevent
dislocation
Hip joint vs. Knee joint• Hip - ball and socket
joint
• Can flexion, extension, rotate, abduction and adduction
• Knee – hinge joint
• Flexion and extension
Structure of striated muscle fibers
Sliding Filament Theory of How Muscles Contract
Sliding Filament Theory Animation
• www.blackwellpublishing.com/matthews/myosin.html
• http://bcs.whfreeman.com/thelifewire/content/chp47/4702001.html
ELECTRON MICROGRAPHS of Sarcomeres relaxed and contracted