1. PowerPoint ® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PART A 6 The Muscular System

2. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings The Muscular System Overview of Muscle Tissues  Myo, mys, & sarco  muscle  3 Types 1. 2. 3.

3. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Comparison of Skeletal, Cardiac, and Smooth Muscles Table 6.1 (1 of 2)

4. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Comparison of Skeletal, Cardiac, and Smooth Muscles Table 6.1 (2 of 2)

5. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings SKELETAL MUSCLES Connective Tissue Surrounding  Cells & muscles are surrounded and bundled by connective tissue  Attach to Bones:  Tendons  Aponeuroses

6. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Skeletal Muscle Functions  M  Posture  Stabalizing Joints  Generate heat

7. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Skeletal Muscle Activity Skeletal Muscle Cell Characteristics  Excitability:  Contractility:  Extensibility:  Elasticity: recoil

8. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Microscopic Anatomy of Skeletal Muscle  Fibers =  Sarcolemma  Myofibrils: long, thin organelles full of proteins  Striations  Proteins: Myosin & Actin Segment of a Fiber

9. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Myofibrils …  Sarcomere: functional unit of Myofibril  Sarcomeres shorten:  mechanism;:  Calcium  Myofibrils _____________  Cell ______________   Muscle _________________

10. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Sarcomeres

11. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Neurons of the Nervous System  Neuron parts  Cell Body  Axon  Axon Terminals  Dendrites Cell body Dendrites Axon Axon Terminals

12. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Figure 7.1 Types of Neurons Sensory Motor Integration Neurons of the Nervous System …

13. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Skeletal Muscle Activity …  Stimulation via Nervous System  Contraction initiated by:  Action Potential = Nerve Impulse - mechanism Terminal Axon of Motor Neuron Muscle Fiber

14. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Skeletal Muscle Activity … Stimulation via Nervous System …  Motor Unit = _______________________________

15. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Stimulation via Nervous System …  Transfer of Action Potential to Fiber  Neuromuscular Junction  Neurotransmitter: Neuromuscular Junction Neurotransmitters

16. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Contraction Steps: Beginning to End 1. Motor Neuron  Action Potential 2. Neurotransmitter

17. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Figure 6.6 2. Action Potential in Fiber 3. Calcium enters sarcomeres Ca

18. Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings 4. Proteins in Sarcomere 5. Myofibril 6. Fibers 6. Muscle contracts