Presentation is loading. Please wait.

Presentation is loading. Please wait.

Essentials of Human Anatomy & Physiology Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slides 6.1 – 6.17 Seventh Edition Elaine.

Similar presentations


Presentation on theme: "Essentials of Human Anatomy & Physiology Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slides 6.1 – 6.17 Seventh Edition Elaine."— Presentation transcript:

1 Essentials of Human Anatomy & Physiology Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slides 6.1 – 6.17 Seventh Edition Elaine N. Marieb Chapter 6 The Muscular System Lecture Slides in PowerPoint by Jerry L. Cook

2 The Muscular System Slide 6.1 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Named for Latin word “mus” meaning little mouse  Dominant tissue in heart and the walls of other hollow organs  Essential function is to shorten or contract  Responsible for all body movement

3 The Muscular System Slide 6.1 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Three basic muscle types are found in the body  Skeletal muscle  Cardiac muscle  Smooth muscle  Differ in cell structure, location in body and how they’re stimulated to contract

4 Characteristics of All Muscle Types Slide 6.2 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Muscle cells are elongated & called fibers  Contraction of muscles is due to the movement of myofilaments  All muscles share some terminology  Prefixes myo & mys refers to muscle  Prefix sarco refers to flesh

5 Skeletal Muscle Characteristics Slide 6.3 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Most are attached by tendons to bones  Cells are cigar shaped & multinucleate  Striated – have visible banding  Largest of the muscles (up to 1 foot)  Voluntary – subject to conscious control  Often react involuntarily or by reflex

6 Skeletal Muscle Characteristics Slide 6.3 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Can contract rapidly & with great force but tires easily  Fibers (cells) are surrounded and bundled by connective tissue  This allows skeletal muscle to exert great force without damaging the muscle fibers

7 Connective Tissue Wrappings of Skeletal Muscle Slide 6.4a Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Endomysium – around single muscle fiber  Perimysium – around a fascicle (bundle) of fibers Figure 6.1

8 Connective Tissue Wrappings of Skeletal Muscle Slide 6.4b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  3 layers of connective tissue: endomysium, perimysium & epimysium  Each layer gets thicker & tougher Figure 6.1

9 Skeletal Muscle Attachments Slide 6.5 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Epimysium blends into a connective tissue attachment, usually a tendon which attaches to a bone  Sites of muscle attachment  Bones (attached by tendon)  Cartilages  Connective tissue coverings of muscles

10 Smooth Muscle Characteristics Slide 6.6 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Has no striations  Spindle-shaped cells  Single nucleus  Involuntary – no conscious control  Found mainly in the walls of hollow organs Figure 6.2a

11 Smooth Muscle Characteristics Slide 6.6 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Arranged in sheets or layers – one runs circular or around & the other runs up and down  2 layers take turns contracting & relaxing to change shape of organ and move food or waste through the digestive system, etc  A slow steady contraction that goes on almost continuously Figure 6.2a

12 Cardiac Muscle Characteristics Slide 6.7 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Has striations  Usually has a single nucleus  Involuntary  Found only in the heart  Joined to another muscle cell at an intercalated disc Figure 6.2b

13 Cardiac Muscle Characteristics Slide 6.7 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Muscle is arranged in spirals or figure 8s  This causes the chambers to get smaller & squeeze the blood out when it contracts  Contracts at a steady rate controlled by the heart’s pacemaker – nervous system can speed it up Figure 6.2b


Download ppt "Essentials of Human Anatomy & Physiology Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slides 6.1 – 6.17 Seventh Edition Elaine."

Similar presentations


Ads by Google