Chapter 10 Muscle Tissue

Chapter 10 Muscle Tissue - Chapter 10 Muscle Tissue Pages...

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Chapter 10 Muscle Tissue Pages 301 – 314; 318 – 320; 324—328; 331 1. Types of Muscle Tissue 40-50% of our body weight. Chemical Energy is converted into Mechanical Energy Alternates between contraction and relaxation. Myo=Muscle Relating Skeletal : Moves bones of Skeleton. o Striated, Mostly Voluntary, Subconsciously (Diaphragm) Cardiac: Forms muscle of the heart wall. o Striated, Branching, Autorhythmic, Pacemaker (Generates own signals). Smooth: Muscles that are located in hollow internal structures. o Non-Striated, Involuntary, Autorhythmic (GI Tract). Controlled by autonomic nervous system. 2. Functions of Muscle Tissue 1. Movement : Relies on the integration functioning of skeletal muscles, bones, and joints . 2. Stabilizing Body Position: Maintain body positions; Can hold head up because of this function. 3. Storing and Moving Substances: Sphincters prevent outflow of contents in hollow regions ( especially the stomach) . Heart helps regulate blood flow. Urinary bladder (storage). 4. Generating Heat: Heat produced by muscle contractions to keep body temp at 37° ; Shivering is the involuntary muscle to produce heat . 5. Support Soft Tissue: Protects all the organs in the belly and hold the floor of the pelvic cavity. 3. Properties of Muscle Tissue 1. Electrical Excitability: Ability to generate action potentials and works through electrical signals. Otherwise the muscle can’t function. 2. Contractility: Ability to create contraction . 3. Extensibility: Ability of muscular tissue to stretch without being damaged .
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4. Elasticity: Ability of muscular tissue to return to its original length and position . 4. Skeletal Muscle Tissue: Fig. 10.1 Muscle Fiber: Same as muscle cell and makes up the muscle by having hundreds or thousands of these cells . o Filled with myofibril and is multinucleated o Are 4-8 inches long and have lots of the axons of the nervous system. o The connective tissue and how it’s layered makes it very strong. Outermost muscle for single muscle covering is the epimysium. Next in is the fascicle and is covered by the perimysium. Next is the muscle fiber and is covered by the endomysium. Fascia: Connective tissue that separates an individual or groups of muscles, and is the very outermost covering Tendon : The collagen fibers are woven into the periosteum of the bone and it makes it very strong. Neuromuscular Junction: How nerves communicate with the muscle, telling them what to do. A. Microscopic Anatomy of a Skeletal Muscle Fiber Skeletal Muscle Fiber: See muscle fiber. Myoblasts: Fuses together to create a muscle fiber. This is the reason why it’s multinucleated. Muscle fibers cannot undergo mitosis, hence the number remains
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Chapter 10 Muscle Tissue - Chapter 10 Muscle Tissue Pages...

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