Can exert forces from a fraction of an ounce to > 70 lbs

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1 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Name Muscle Cell = My / Mys = Sarc = Muscle Cell Plasma Membrane = Muscle Celly Cytplasm = Three types f muscle tissue: Skeletal Muscle in the human bdy and bny skeletn Can exert frces frm a fractin f an unce t > 70 lbs Smth Muscle Lcatins include: Cardiac Muscle Only in the

2 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Cntracts at a steady rate set by Skeletal Smth Cardiac Special Functinal Prperties f Muscle Tissue Excitability Cntractility Extensibility Elasticity Muscle Functins Frm here frward, we are talking abut muscle Skeletal Muscle Grss Anatmy Each muscle is a Cmpsed f Skeletal Muscle Grss Anatmy Cmpsitin Nerve & Bld Supply Cnnective Tissue Sheaths Muscle Attachments 2

3 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Nerve & Bld Supply Each muscle has Skeletal Muscle Grss Anatmy Cmpsitin Nerve & Bld Supply Cnnective Tissue Sheaths Muscle Attachments Cnnective Tissue Sheaths Endmysium Within the muscle Surrunds: Perimysium Arund the muscle Surrunds: Epimysium Upn the muscle Surrunds: Ø All three cnnective tissue sheaths are cntinuus with and the that jin t. Muscle Attachments Skeletal muscles span jints and are attached t bne in at least tw places Bth insertin and rigin attachments can be 3

4 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Skeletal Muscle: Grss & Micrscpic Anatmy Skeletal Muscle Micrscpic Anatmy Muscle cell = Diameter = micrmeters (HUGE) Length = up t 30 cm lng (phenmenal) Muscle Fiber (Cell) Structure Plasma Membrane = Cytplasm = Nuclei: Hw many? Where? Mitchndria: Hw many? Why? Endplasmic reticulum = And all the usual eukarytic rganelles 4

5 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Unique t Muscle Fibers (Muscle cells) Glycsmes Myglbin Cellular Respiratin: Energy à Energy Muscles: Energy à Energy Oxygen is needed fr Aerbic respiratin prduces ATP N xygen = anaerbic = fermentatin = 4 ATP Als lactic acid build- up and sre muscles Myfibrils Densely packed, rdlike cntractile elements Densely packed Rdlike Cntractile Arrangement f myfibrils in a muscle fiber gives: 5

6 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Sarcmeres Cmpsed f Myfilaments are made up f Tw types f myfilaments Myfilament Banding Thick Filaments Thin Filaments Z Disc Ø Why is the I band light? Ø What is cntained in it? Ø Why is the A band dark? Ø What is cntained in it? Myfilament banding is what gives skeletal and cardiac muscles a striped appearance. 6

7 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue In yur wn wrds, based n these illustratins: Describe the structure f the thin actin filament (blue). Describe the structure f the thick mysin filament (red). 7

8 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Nw make yur wn illustratins: One f the thin actin filament Tw f the thick mysin filament: individual and grup One f the thin and thick filaments tgether Thick Filaments Cmpsed f the prtein Mysin = Tail: Heads: Thin Filaments Heads link thick and thin filaments tgether via Cmpsed mstly f the prtein Active Sites: Nte: There are additinal filaments being discvered! 8

9 Anatmy & Physilgy Chapter 9 Ntes: Muscles and Muscle Tissue Sacrplasmic Reticulum Elabrate, smth that runs and This frms called terminal cisternae terminal = cisternae = Terminal cisternae always ccur in T- Tubules Sarclemma is what? WHY? T- Tubules run between Frms a pass thse impulses t every in every in every in every 9

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