chapter12b Muscles

chapter12b Muscles - Chapter 12b Muscles Summation of...

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Chapter 12b Muscles
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Summation of Contractions Figure 12-17a
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Summation of Contractions Figure 12-17b
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Summation of Contractions Figure 12-17c
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Summation of Contractions Figure 12-17d
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Motor Units Figure 12-18 SPINAL CORD Neuron 1 Neuron 2 Neuron 3 Motor nerve Muscle fibers Motor unit 2 Motor unit 1 Motor unit 3 One muscle may have many motor units of different fiber types. KEY PLAY Interactive Physiology® Animation: Muscular System: Contraction of Motor Units
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Mechanics of Body Movement Isotonic contractions create force and move load Concentric action is a shortening action climbing Eccentric action is a lengthening action Downhill skiing, going down stairs Isometric contractions create force without moving a load Series elastic elements; sarcomeres shorten while elastic elements stretch resulting in little change in overall length
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Isotonic Contraction Figure 12-19a
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Isometric Contraction Figure 12-19b
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Series Elastic Elements in Muscle Figure 12-20 Contractile components Elastic components Triceps muscle Biceps muscle Elastic element Sarcomeres Schematic of the series elastic elements Muscle at rest Isotonic contraction: Sarcomeres shorten
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chapter12b Muscles - Chapter 12b Muscles Summation of...

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