BIOLOGY 220
ANATOMY & PHYSIOLOGY I
OBJECTIVES
Unit XIII - MUSCULAR SYSTEM
Introduction
- List and describe the functions of the muscular system.
- Name and describe the characteristics of muscles.
- List and describe the three types of muscle tissues.
- Describe gross anatomy of the skeletal muscle.
Anatomy of Skeletal Muscle Fiber
- Describe the structure and function of the skeletal muscle fiber.
- Describe the structure and function of the sarcomeres.
- Describe the structure and functions of the myofilaments (actin and myosin).
- Explain the function and importance of a motor unit.
Neuromuscular Junction
- Name the components of the neuromuscular junction.
- Describe the events at the neuromuscular junction.
Sliding Filament Theory of Contraction
- Describe the sliding filament theory of skeletal muscle contraction.
- Describe the role of calcium in skeletal muscle contraction.
- Describe the role of ATP in skeletal muscle contraction.
- Describe the process of skeletal muscle fiber relaxation.
- Explain how the skeletal muscle returns to resting length.
Muscle Tension
- Describe and differentiate between internal and external tension.
- Describe the relationship between frequency of muscle stimulation and tension:
- list and describe the components of a twitch and wave summation
- define and describe treppe
- define and describe incomplete (unfused) tetanus
- define and describe complete (fused) tetanus
- Describe the relationship between the length of a muscle fiber and tension.
- Describe the relationship between stretch of a muscle fiber and contraction.
- Describe the relationship between the number of fibers contracting and tension
in the whole muscle.
- Describe the role of motor units in maintaining muscle tone.
Types of Skeletal Muscle Contractions
- Name the two types of skeletal muscle contractions.
- Describe an isometric contraction.
- Describe an isotonic contraction.
- Describe and differentiate between concentric and eccentric isotonic contractions.
- List and describe the skeletal muscle disorders.
Muscle Metabolism
- List the three mechanisms of ATP formation in muscle.
- Describe the process of direct phosphorylation (phosphagen system).
- Describe the process of fermentation (anaerobic glycolysis).
- Describe the process of aerobic respiration.
- Compare the three methods of ATP production.
Muscle Fatigue and Recovery
- Define the skeletal muscle fatigue.
- Describe the causes of the skeletal muscle fatigue.
- Describe the processes involved in skeletal muscle recovery.
Types of Skeletal Muscle Fibers
- Describe how skeletal muscles are classified.
- Describe the effect of aerobic exercise on the types of fibers in a skeletal muscle.
Hormones and Skeletal Muscles
- Describe the effect of growth hormone (GH) and testosterone on skeletal muscles.
- Describe the effects of thyroid hormones (T3 and T4) on skeletal muscles.
- Describe the effects of epinephrine on skeletal muscles.
- Describe the effects of insulin and glucagon on skeletal muscles.
Skeletal Muscle Movement
- Describe the parts of a muscle relative to movement.
- Define the skeletal muscle lever system.
- Describe and give an example of the first class lever system of skeletal muscle movement.
- Describe and give an example of the second class lever system of skeletal muscle movement.
- Describe and give an example of the third class lever system of skeletal muscle movement.
- Define agonist, synergist, antagonist, and fixator.
Smooth Muscles
- List and describe the structural features of the smooth muscles.
- Describe the process of smooth muscle excitation and contraction.
- Name the two types of smooth muscle fibers.
- Describe how the smooth muscles are controlled.
- Describe the relationship between smooth muscle length and tension.
- Describe the stress - relaxation response of the smooth muscles.