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Unformatted text preview: (c) aerobic catabolism 2 Speed of muscle contraction/relaxation (1) myosin heavy chain isoforms : b the rate of ATP hydrolysis varies (2) Sequestration of Ca2+ by Ca2+ ATPase (3) Speed of contraction: FG > FO > SO Neuronal control of muscle contraction Vertebrates Invertebrates Motor unit c Vertebrates : (a) antagonistic pairs – flexor and extensor muscles (b) excitatory - ACh (c) increasing muscle tension b no gradation in a motor unit b High-frequency AP b activating more motor units b different types of muscle fibers c Arthropods: (a) all-or-none twitch + graded (multi-synaptic terminals) (b) multi-neuronal innervation (excitatory + inhibitory)...
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- Spring '09
- muscle tension, different muscle fibers