ECG, MUSCLE FIBRES, SLIDING FILAMENT

• TASK Label the components of this muscle fibre
• Tranemone tubele (T) tubules.
• TASK 4: Match keywords to definitions AFTER the video has finished
• Sarcolemma


  The membrane around a muscle fiber
• Myofibril


  Contractile sub-units that make up the muscle fiber
• Muscle fiber


  Very long cells that run along the entire muscle
• Actin and myosin


  Filaments made of protein that interlock together in order to cause the muscle to contract
• Sarcomere


  Repeating sub-units found in the myofibrils that contain actin and myosin
• Sarcoplasmic reticulum


  A network of membranes that surround the myofibri containing many calcium ions
• T tubules


  Indentations of the muscle sarcolemma that pass close to the sarcoplasmic reticulum
• TASK 5: Label the components and bands of this sarcomere
• I Band
• actin mous
• A Band.
• 2 line
• ty where the
• actin finishes.
• BTEC Levig
• 123 Types of Muscle F
• 1. Label all visible components of this made fibre
• PRACTICE QUESTIONS
• 2. What is the
• sarcolemma


  The membrane around a muscle fire
• Myofibril


  subunits that make imp muscle fibre.
• Sarcomere


  nepasing subunit in myofient that has acti and my osin.
• Multinucleated having more than are nucleus.
• 3. Describe how a skeletal muscle is organised. Include a description of each structure from largest to smallest
• 4. Explain how actin and myosin are important in the sliding filament model of muscle contraction
• BTEC Level 3-Unit 1 Biology
• Ms lake
• L13: Types of Muscle Fibres
• Name: Aayusha
• Describe the structural difference between fast-twitch and slow-twitch fibres
• Explain how fast and slow twitch fibres are more suited to different sports
• STARTER Exam Questions-no taking, independent work!
• 01. Explain the difference in speed of the nerve impulse along myelinated versus unmyelinated neurons (2 mark)
• 02. Explain the function of the sarcoplasmic reticulum in skeletal muscle (3 marks)
• 03 E. col is a Gram-negative bacteria. Explain how the structure of E. col prevents penicilin from being an effective treatment (2 marks)
• Q4. Explain what happens to acetylcholine in the neuromuscular junction when its function is complete (3 marks)
• Correction: Role of the Capsid