B6A13xBugMuscleF11

B6A13xBugMuscleF11 - Musculoskeletal systems Vertebrate...

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Unformatted text preview: Musculoskeletal systems Vertebrate vs. Arthropod Muscles Small bodies cannot fit hundreds of fibers into each muscle Vertebrate Skeletal Muscle Arthropod Skeletal Muscle Fibers/Muscle 100–1000s 1–10s Fiber innerva9on 1 motor end plate from 1 Mul> ­terminal & motor neuron/fiber polyneuronal Motor neuron ac9on Always excitatory Some excitatory; some inhibitory Neurotransmi<er Acetyl ­choline Glutamate [E]; GABA [I] Fiber conduc9on of depolariza9on Cell membrane & T ­tubules of en>re fiber Localized T ­tubules only Fiber contrac9on All ­or ­none twitch Graded Muscle strength/ speed Recruit more fibers per muscle Recruit more sarcomeres per fiber Vertebrate vs. Arthropod Muscles Small bodies cannot fit hundreds of fibers into each muscle hPp://www.physioviva.com/movies/insect_muscle_innerva>on/ Heyer 6b ...
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