BIOLOGY 220

ANATOMY & PHYSIOLOGY I

OBJECTIVES

Unit XIII - MUSCULAR SYSTEM

Introduction

  1. List and describe the functions of the muscular system.
  2. Name and describe the characteristics of muscles.
  3. List and describe the three types of muscle tissues.
  4. Describe gross anatomy of the skeletal muscle.

Anatomy of Skeletal Muscle Fiber

  1. Describe the structure and function of the skeletal muscle fiber.
  2. Describe the structure and function of the sarcomeres.
  3. Describe the structure and functions of the myofilaments (actin and myosin).
  4. Explain the function and importance of a motor unit.

Neuromuscular Junction

  1. Name the components of the neuromuscular junction.
  2. Describe the events at the neuromuscular junction.

Sliding Filament Theory of Contraction

  1. Describe the sliding filament theory of skeletal muscle contraction.
  2. Describe the role of calcium in skeletal muscle contraction.
  3. Describe the role of ATP in skeletal muscle contraction.
  4. Describe the process of skeletal muscle fiber relaxation.
  5. Explain how the skeletal muscle returns to resting length.

Muscle Tension

  1. Describe and differentiate between internal and external tension.
  2. Describe the relationship between frequency of muscle stimulation and tension:
    1. list and describe the components of a twitch and wave summation
    2. define and describe treppe
    3. define and describe incomplete (unfused) tetanus
    4. define and describe complete (fused) tetanus
  3. Describe the relationship between the length of a muscle fiber and tension.
  4. Describe the relationship between stretch of a muscle fiber and contraction.
  5. Describe the relationship between the number of fibers contracting and tension in the whole muscle.
  6. Describe the role of motor units in maintaining muscle tone.

Types of Skeletal Muscle Contractions

  1. Name the two types of skeletal muscle contractions.
  2. Describe an isometric contraction.
  3. Describe an isotonic contraction.
  4. Describe and differentiate between concentric and eccentric isotonic contractions.
  5. List and describe the skeletal muscle disorders.

Muscle Metabolism

  1. List the three mechanisms of ATP formation in muscle.
  2. Describe the process of direct phosphorylation (phosphagen system).
  3. Describe the process of fermentation (anaerobic glycolysis).
  4. Describe the process of aerobic respiration.
  5. Compare the three methods of ATP production.

Muscle Fatigue and Recovery

  1. Define the skeletal muscle fatigue.
  2. Describe the causes of the skeletal muscle fatigue.
  3. Describe the processes involved in skeletal muscle recovery.

Types of Skeletal Muscle Fibers

  1. Describe how skeletal muscles are classified.
  2. Describe the effect of aerobic exercise on the types of fibers in a skeletal muscle.

Hormones and Skeletal Muscles

  1. Describe the effect of growth hormone (GH) and testosterone on skeletal muscles.
  2. Describe the effects of thyroid hormones (T3 and T4) on skeletal muscles.
  3. Describe the effects of epinephrine on skeletal muscles.
  4. Describe the effects of insulin and glucagon on skeletal muscles.

Skeletal Muscle Movement

  1. Describe the parts of a muscle relative to movement.
  2. Define the skeletal muscle lever system.
  3. Describe and give an example of the first class lever system of skeletal muscle movement.
  4. Describe and give an example of the second class lever system of skeletal muscle movement.
  5. Describe and give an example of the third class lever system of skeletal muscle movement.
  6. Define agonist, synergist, antagonist, and fixator.

Smooth Muscles

  1. List and describe the structural features of the smooth muscles.
  2. Describe the process of smooth muscle excitation and contraction.
  3. Name the two types of smooth muscle fibers.
  4. Describe how the smooth muscles are controlled.
  5. Describe the relationship between smooth muscle length and tension.
  6. Describe the stress - relaxation response of the smooth muscles.