Kinesiology 2241A/B Study Guide - Midterm Guide: Myofilament, Globular Protein, Skeletal Muscle
20 Mar 2016
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Document Summary
Whole muscle is made up of bundles of fascicles. Each fascicle contains bundles of muscle cells (also called muscle fibers) Within each muscle cell there are long cylindrical structures called myofibrils running the length of the cell. Myofibrils are made up of myofilaments, which contains actual proteins responsible for muscle contraction. Two types of myofilaments- thin myofilaments and thick myofilaments. ***to remember the order of muscle structure, it"s in alphabetical order. A skeletal muscles is striated- shows banding pattern under a light microscope, banding pattern comes from the arrangement of the thin and thick myofilaments. Number of muscle cells in a whole muscle depends on size of whole muscle. Length of muscle cell can vary from a few mm to 12 cm long (depending on size of whole muscle) Skeletal muscle contains many nuclei and mitochondria to make atp. Sarcolemma- cell is surrounded by a cell membrane called the sarcolemma, cytoplasm is inside the sarcolemma.
