KINESIOL 2C03 Study Guide - Final Guide: Platysma Muscle, Perimysium, Endoplasmic Reticulum
6 Apr 2017
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Document Summary
Skeletal muscle makes up 40-45%/23-25% of adult male and female body weight. Muscle is made up of muscle fibres (which contain myofibrils and myofilaments) Epimysium is a tough protective membrane that surrounds the outside of a muscle. Myofilaments: myofilaments, such as actin and myosin bind together with m-lines and z-lines to for a sarcomere. Sarcomere: sarcomeres bunch together to form a myofibril. Myofibrils: bundles of myofibrils form a muscle fibre. Muscle fibre: bundles of muscle fibres for a muscle. The fibres are between 10-100 um thick and can be anywhere between a few. Fibres are bound into bundles known as fasciculi; fasciculus. There are (cid:883)(cid:882)(cid:882)(cid:882)(cid:495)s of fibres per muscle. They are arranged in a polygonal shape which allows greater packing this leaves less extra cellular space mm to several cm in length. Muscle fibres are separated and held together within a muscle by a membrane known as perimysium. Each individual muscle fibre is surrounded by an endomysium.
