Read the following statements and choose the following option: 1. Myofibril has striated appearance 2. Myofibril contains actin and myosin 3. White fibres depend on anaerobic respiration. 4. Red fibres depend on aerobic respiration. 5. Red fibres contain high amount of myoglobin.

Step-by-step solution

Each myofibril has alternate dark and light bands on it. A detailed study of the myofibril has established that the striated appearance is due to the distribution pattern of two important proteins – Actin and Myosin. Myoglobin content is high in some of the muscles which gives a reddish appearance. Such muscles are called the Red fibres. These muscles also contain plenty of mitochondria which can utilise the large amount of oxygen stored in them for ATP production. These muscles, therefore, can also be called aerob