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Anatomy Session 9: Muscular System
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Anatomy Session 9: Muscular System

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Questions and Answers

What surrounds the entire muscle?

  • Perimysium
  • Epimysium (correct)
  • Endomysium
  • Fascia
  • Which of the following is a characteristic of muscle fibers?

  • They are the largest unit of skeletal muscle organization
  • They are a type of connective tissue
  • They are about 3 cm long and 0.05 mm wide (correct)
  • They are surrounded by perimysium
  • What is the function of the epimysium layer?

  • To surround individual muscle fibers
  • To bind all muscle fibers together (correct)
  • To surround the entire skeletal muscle system
  • To surround fascicles
  • What is the correct sequence of skeletal muscle organization?

    <p>Muscle fiber, muscle fascicle, skeletal muscle</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a muscle fiber?

    <p>It is a type of connective tissue</p> Signup and view all the answers

    What is the primary function of skeletal muscle?

    <p>Produce body movements</p> Signup and view all the answers

    Which type of muscle is known for being involuntary and non-striated?

    <p>Smooth muscle</p> Signup and view all the answers

    What percentage of a person's body weight is made up of skeletal muscles?

    <p>40 percent</p> Signup and view all the answers

    What is the term for the study of the structure, function, and diseases of muscle?

    <p>Myology</p> Signup and view all the answers

    What is a characteristic feature of skeletal muscle when examined under a microscope?

    <p>Markedly striated</p> Signup and view all the answers

    Study Notes

    Muscular System

    • Muscle tissue is specialized for contraction and makes up about 40% of a person's body weight.
    • There are over 650 skeletal muscles in the human body.

    Types of Muscle

    • There are three types of muscular tissue: skeletal muscle, cardiac muscle, and smooth muscle.
    • Skeletal muscle:
      • Found attached to bones of the skeleton
      • Voluntary, striated
      • Attached to bone and causes movement of the body
      • Known as voluntary muscle because it can be contracted at will
      • Appears markedly striated when examined with a microscope
    • Cardiac muscle:
      • Found in the heart
      • Involuntary, striated, branching
    • Smooth muscle:
      • Found in organs
      • Involuntary, non-striated

    Functions of Muscle

    • Produce body movements
    • Maintain posture/body position
    • Heat production

    Microscopic Anatomy of Skeletal Muscles

    • Skeletal muscle structure consists of bundles of tiny fibers that run the length of the muscle.
    • Most fibers are about 3 cm long and 0.05 mm wide.
    • Three connective tissue sheaths: epimysium, perimysium, and endomysium.
      • Epimysium: surrounds the entire muscle, dense irregular connective tissue
      • Perimysium: surrounds fascicles, dense irregular connective tissue
      • Endomysium: surrounds individual muscle fibers, reticular connective tissue
    • Nerves and blood vessels enter, exit, and branch throughout connective tissue.

    Organization of Skeletal Muscle

    • A skeletal muscle cell is called a muscle fiber.
    • A muscle fiber contains organelles called myofibrils.
    • Myofibrils are groups of contractile proteins, actin and myosin, arranged in a sarcomere.
    • Sarcomere arrangement creates the “stripes” seen in skeletal muscle.
    • Muscle fibers are grouped in bundles called fascicles.
    • Perimysium layer encases the fascicles.
    • Epimysium layer surrounds the muscle as a whole and binds all the muscle fibers together.
    • Connective tissue called fascia surrounds the muscle outside the epimysium.

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    Description

    This quiz covers the basics of the muscular system, including the types of muscles, their functions, and the microscopic anatomy of skeletal muscle.

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