Anatomy and Cell Biology 3309 Study Guide - Final Guide: Adherens Junction, Myocyte, Rigor Mortis
8 Dec 2011
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O around each muscle fiber is the endomysium. This is a loose ct: around each fascicle is the perimysium. This is also a loose ct: around each muscle is the epimysium. The loose cts are reticular cts: therefore, they have type iii collagen. The cts align the contraction of the muscle: they all fuse to form the tendon. There are 2 types of skeletal muscle fibers: red (type i) They are slow to fatigue: white (type ii) They are used for short bursts of power or energy, after which they fatigue. Depending on the activity, the relative balance of these muscle fiber types can change. As mentioned, sarcomeres are the individual units responsible for the contraction of skeletal muscle: they have a distinct structure. The i band represents the thin myofilaments; there are a lot of mitochondria here. The h-zone is the distance between the lateral actin filaments (this distance can decrease during contraction)
