2. Movement and Locomotion

2. Movement and Locomotion -...

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Movement and Locomotion Reading: Chapter 49: pp. 1063 - 1074 SKELETONS SUPPORT AND PROTECT THE BODY AND ARE ESSENTIAL FOR MOVEMENT Types of skeletons o Hydrostatic skeleton earthworm, hydra o Exoskeleton insects, crustacea o Endoskeleton internal skeleton – mammals, vertebrates Skeletal muscles  move skeletal parts by contracting STRUCTURE AND FUNCTION OF VERTEBRATE SKELETAL MUSCLE Structure of skeletal muscle – fig. 49.28 Muscle fiber = muscle cell (often multi-nuclei) o Myofibrils bundle of contractile filaments each myofibril is surrounded by sarcoplasmic reticulum (SR) (sarco~ means muscle) ? Thin filaments Actin (contractile protein) filaments (+ regulatory proteins) ? Thick filaments Myosin (contractile protein) filaments (+ regulatory proteins) ? Sarcomere Functional unit of contraction Z lines Define the sarcomere; actin filaments are attached to Z lines
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This note was uploaded on 11/16/2011 for the course BIOL 107 taught by Professor Abbot during the Spring '08 term at UConn.

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2. Movement and Locomotion -...

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