Chapter 09 Lecture Outline
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1 Chapter 09 Lecture Outline 9-1 Chapter 9 Muscular System: Histology and Physiology Refer to link to better visualize muscle histology
2 Contractility: ability of a muscle to Excitability: capacity of muscle to Extensibility: muscle can Elasticity: ability of muscle to 9-4 Skeletal-- voluntary or involuntary?, facial expressions,, Smooth-- involuntary or voluntary? Walls of,,,,, Functions: In some locations, Controlled by and Cardiac-- involuntary or voluntary? Heart: Controlled and 9-5 Skeletal Muscle Structure Composed of Fibers are,, Tend to be smaller diameter in small muscles and larger in large muscles. 1 mm- 4 cm in length Develop from myoblasts; numbers remain constant Striated appearance due to and 9-6 2
3 Muscle fibers = Muscle cells r surrounded & on the Necrotizing fascitis (flesh eating bacteria) Bacteria species breaks down fascitis -- difficult to treat Some anaerobic Clostridium perfringes p:// p:// 000&sz=82&hl=en&start=2&um=1&tbnid=h 0Llnndlz0rb8M:&tbnh=98&tbnw=149&prev =/images%3fq%3dnecrotizing%2bfasciitis %26um%3D1%26hl%3Den%26client%3Dsa fari%26rls%3den%26sa%3dn =en&resnum=0&q=necrotizing+fasciitis&um=1&ie=utf- 8&sa=N&tab=wi 9-8 MUSCLE Has Blood vessels and Nerves What are the BV for? What are the Nerves for? Region where Nerve and Muscle Fiber is the 9-9 3
4 Attachments Direct: Skeletal muscle attachmet to bones--> to what membrane? Indirect: -- sheet like structure- - connects Ex: Occipital frontalis Very 9-10 Origin Insertion 9-11 Plasma membrane = -- Function: Duschenne s muscular dystrophy Deterioration of??? (usually) What does recessive mean?
5 Sarcoplasm -- same as? Glycosomes Myoglobin? 9-13 Muscle fiber Within muscle fiber are next to another, and another, and another and so on. Refer to text diagram 9-14 Muscle Fibers Nuclei just inside Cell packed with myofibrils within Threadlike Composed of called : and Sarcomeres: highly ordered repeating units of
6 Parts of a Muscle Refer to diagrams in the web below for better understanding Skeletal%20Muscle%20fibers.jpg Light and dark band! Myosin head Actin-thin filament Myosin-thick filament 9-17 Actin and Myosin Myofilaments du/cso/paper/image005.jpg&imgrefurl= /cso/paper.html&h=276&w=437&sz=26&hl=en&start=13&um=1&t bnid=7ddxhexxlz1rmm:&tbnh=80&tbnw=126&prev=/images%3 Fq%3Dactin%2Bmyosin%2Bfilaments%26um%3D1%26hl%3Den% 26client%3Dsafari%26rls%3Den%26sa%3DN
7 sliding over myosin to sarcomeres Actin and myosin responsible for skeletal During relaxation, sarcomeres lengthen because of 9-19 Sarcomere Shortening
8 Muscles work with other muscles Prime mover causes movement Antagonist opposes prime mover Flexion of elbow-- prime mover--> biceps Extension --> triceps 9-22 Tibialis anterior-- where? # of head on biceps? Triceps? 9-23 Gluteus maximus Careful not to hit the Gluteus medius Deltoid Vastus lateralis
9 An electrical signal originates from the Innervates Action potential sent to. Axons convey An electrical signal orginates in what organ? Action Potential (AP) sent to effectors. Axon conveys electrical signals to muscle cells to create? m.gif
10 Electrical charge is membrane potential 9-28 Ligand gated channels Activated by a Ligand Voltage gated channels Acts in response to 9-29 GRAPH!!!!
11 electrical change across membrane A reverse in membrane potential Electrical charge gets reversed goes DONE!!!! Cell cannot fire another signal -- why? Every AP looks like graph, then how can we tell difference tween strong stimulus vs weak one? lkjh
12 Action Potential Propagation
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