A striated muscle contains many fibres, and each fibre is built from myofibrils. The striped look of the muscle fibre comes from the way two kinds of protein filaments, thick filaments and thin filaments, are organised within the sarcomeres of the myofibril.
(a)[4]
Describe the key structural features of thick filaments and thin filaments in the sarcomere.
(b)[5]
Describe the function of calcium ions in striated muscle contraction.
(c)[4]
Muscle cells sometimes need to respire in anaerobic conditions. Describe how respiration occurs in anaerobic conditions in a muscle cell and state why it is important that this process occurs.
Worked solution & mark scheme
This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A description covering the structure of thick filaments and thin filaments has been provided.” …