Lecture 5 - Motor Mechanism

Peristalsis contrac4on of heart muscle moves blood

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Unformatted text preview: Caffeine •  Phosphoric acid •  Caramel color (E150d) •  Natural flavorings Carbon dioxide Caffeine Phosphoric acid 16 Bone and disease •  Rickets –  Improper mineral deposi4on –  Usually due to inadequate dietary calcium intake or inadequate absorp4on of calcium from the small intes4ne –  Prevented or treated with Vitamin D 17 Bone and disease •  Osteoporosis –  Both the mineral and organic por4ons of bone are reduced –  Occurs when the normal balance between bone forma4on and bone breakdown is disrupted –  Can be minimized with adequate calcium intake, weight ­bearing exercise, and adequate dietary vitamin D 18 Movement in vertebrates   Contrac4on/relaxa4on of muscle creates forces that produce movement –  Shortening of skeletal muscle produces a force that results in the movement of bones –  Contrac4on of muscle helps food movement (peristalsis) –  Contrac4on of heart muscle moves blood supply 19 Types of Muscles •  Types of muscle defined by their appearance under the microscope, func4on and control mechanisms –  Skeletal muscle – Associated with bone. Striated muscles (striped) –  Cardiac muscle –Associated with the heart. Strained muscles (striped) –  Smooth muscle (uniform) •  Walls of arteries and in the respiratory, diges4ve and excretory systems •  All use ac4n and myosin to cause muscle contrac4on Skeletal Cardiac Smooth 20 Skeletal Muscle Structure •  Muscle cells are bundle together with connec4ve 4ssue –  Tendons link bones to skeletal muscle in vertebrates 21 Skeletal Muscle Structure 22 Skeletal Muscle Structure •  Muscle cells (also known as muscle fibers) are elongated cells that contain mul4ple nuclei –  Processes need to be coordinated between different nuclei •  Each muscle cell contain hundreds of myofibrils, which are rod ­like structures compose of myosin and ac4n arrays 23 Muscle Structure  ­ Myofibrils •  Myofibrils –  Each repe44ve unit is...
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This document was uploaded on 03/05/2014.

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