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Exploring the Muscular System: Functions, Types, and Mechanisms

Delve into the intricacies of the muscular system encompassing skeletal, visceral, and cardiac muscles. Uncover how muscle tissues aid in movement, posture maintenance, organ protection, and circulation. Learn about muscle functions including muscle vocabulary, stimulation, and contractility. Understand muscle composition, properties, and the mechanisms behind muscle contractions. Explore the skeletal muscle structure with sarcomeres and muscle fibers units. Discover the different types of skeletal muscle parts and movements. Familiarize with visceral and cardiac muscles, along with the sliding filament theory of muscle contraction.

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Exploring the Muscular System: Functions, Types, and Mechanisms

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Presentation Transcript

  1. Muscular System Outline

  2. Skeletal • Visceral • Cardiac 3 Types of Muscle Tissue

  3. Aid in movement • Provide and maintain posture • Protect internal organs • Provide movement of blood, food and waste products throughout the body • Open and close body openings • Produces heat Functions of Muscle

  4. Vocab

  5. Electrically • Mechanically • chemically Muscle stimulation

  6. Irritability or excitability: ability to respond to a stimulus • Contractility: ability to shorten • Extensibility: ability to stretch and lengthen • Elasticity: ability to recoil to its resting length Vocabulary

  7. Makes up 40 % of body weight • Increase in size and weight with exercise • Named according to: • Location • Related bones • Shape • Action • size • Looks striated under microscope • Tendons attach muscle to bone Skeletal Muscle

  8. Sarcomere: • Causes contraction • Made up of actin and mysosin Units of Muscle Fibers

  9. Origin: attached to the less movable part of bone • Insertion: attached to the more movable part of the bone • Body: middle part of the muscle 3 parts of Skeletal muscle

  10. Flexion = decreasing joint angle • Extension = increasing joint angle • Abduction = movement away from midline • Adduction = movement towards the midline • Pronation = turning palms down • Supination = turning palms up

  11. Lines organs • Makes up walls of blood vessels • In the digestive system • Smooth – has no striations • Contracts when stimulated • Controlled by the autonomic nervous system Visceral Muscle

  12. Only in the heart • Striated muscle • Involuntary control Cardiac Muscle

  13. Sliding Filament Theory of muscle contraction

  14. Sliding Filament Theory of muscle contraction

  15. Types of Muscle Contraction

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