Muscle structure


Published on

  • Be the first to comment

Muscle structure

  1. 1. The Musculoskeletal System Muscle Structure Lloyd Dean
  2. 2. Aims Identify the 3 different types of muscle tissues and their characteristics Describe muscle structure State the structure of connective tissues Recall the role of a motor unit
  3. 3. White board splash What are the different types of muscle tissue? How does each differ?
  4. 4. 3 Types Of Muscle Cardiac or Heart Muscle Smooth or Involuntary Muscle Skeletal or Voluntary Muscle
  5. 5. Cardiac Muscle • Occurs only in the heart • Appears striated • Involuntary • Pace maker • 3 Layers of Heart Wall Pericardium (Outer Layer) Reduce friction & maintain heart shape Myocardium (Middle Layer) Largest layer and used in electrical impulse of heart beat Endocardium (Inner Layer) Prevent friction between flowing blood and heart muscle
  6. 6. The Heart Structure “Cardium” – Heart “Peri” – On, around “Myo” – Muscle “Endo” – Within, Inward
  7. 7. • The opposing ends of cardiac muscle cells are separated by "intercalated disks." • They hold cells together and transmit the force of contraction from cell to cell. • Intercellular junctions between the fused membranes of the communication and nerve impulses to be sent from cell to cell.
  8. 8. Cardiac Muscle Heart needs constant supply of fresh oxygen The heart has its own arteries and veins to ensure blood supply continues Some times this blood is prevented from being delivered This is known as Myocardial Ischaemia or Angina
  9. 9. Smooth Muscle Involuntary Unstriated Helps maintain blood pressure  Squeezes substances (i.e., food, feces) through organs Autonomic nervous system – Chemoreceptors and baroreceptors detect changes and starts smooth muscle response
  10. 10. Muscle Structure and Function Articulate Describe each to your study buddy!
  11. 11. Muscle Structure Muscle fibre Myofibril Myofilament
  12. 12. Connective Structures Collagen Most common. Produced by Fibroblasts. Provides strengths and elasticity. Found throughout the body and components of tendons and ligaments. Tendon Connects muscles to bone. Forms into collagen as it attaches to the bone. Ligament Joins a bone to bone. Various ligaments referenced to body position. E.g. Medial, lateral. Fascia Loose connective structure. Imagine a big cobweb that runs through your whole body! Provides stability for muscles and also helps to transmit forces.
  13. 13. Can you spot each connective structure?
  14. 14. Let’s make some muscle! You will need: -Pencils or pens -Paper -Blue tak -Stick tape Can we beat this from last year? What more can we add?
  15. 15. Which statement describes a motor unit? (1 mark) A motor neuron that transmits information to the central nervous system A sensory neuron that detects muscle movement A group of muscles working together to create movement A motor neuron and all of the muscle fibres to which it connects
  16. 16. Motor Units and Recruitment
  17. 17. Motor Units and Recruitment The strength of a muscular contraction will be affected by: The frequency of nerve impulses coming into the muscle cell The number of motor units activated
  18. 18. Exam Questions You create them based on our aims Multiple choice, ensure you know the answer! Put your knowledge to the test here and here via the PurposeGames related activities