BILD2Lec8Figs

BILD2Lec8Figs - pelvic girdle, enable us to rotate our arms...

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Spinal cord Motor neuron cell body Motor neuron axon Nerve Muscle Muscle fibers Synaptic terminals Tendon Motor unit 1 Motor unit 2 Fig. 50-30: Motor units in a vertebrate skeletal muscle
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Summation of two twitches Tetanus Single twitch Time Tension Pair of action potentials Action potential Series of action potentials at high frequency Fig. 50-31: Summation of twitches
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Fig. 50-34a: Bones and joints of the human skeleton Key Axial skeleton Appendicular skeleton Skull Shoulder girdle Clavicle Scapula Sternum Rib Humerus Vertebra Radius Ulna Pelvic girdle Carpals Phalanges Metacarpals Femur Patella Tibia Fibula Tarsals Metatarsals Phalanges 1 Examples of joints 2 3
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Scapula Head of humerus Fig. 50-34b: Ball-and-socket joint Ball-and-socket joints, where the humerus contacts the shoulder girdle and where the femur contacts the
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Unformatted text preview: pelvic girdle, enable us to rotate our arms and legs and move them in several planes. 1 Ulna Humerus 2 Fig. 50-34c: Hinge joint Hinge joints, such as between the humerus and the head of the ulna, restrict movement to a single plane. Ulna Radius 3 Fig. 50-34d: Pivot joint Pivot joints allow us to rotate our forearm at the elbow and to move our head from side to side. Grasshopper Human Biceps contracts Triceps contracts Forearm extends Biceps relaxes Triceps relaxes Forearm flexes Tibia flexes Tibia extends Flexor muscle relaxes Flexor muscle contracts Extensor muscle contracts Extensor muscle relaxes Fig. 50-32: The interaction of muscles and skeletons in movement...
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BILD2Lec8Figs - pelvic girdle, enable us to rotate our arms...

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