2.1 Describe and compare the properties of 3 different types of muscle and explain the sliding filament hypothesis of muscle contraction.
2.2 Explain how antagonistic muscles bring about extension and flexion of either the elbow joint or the knee joint.
3.1 Analyse the effects of bad posture on the muscular and skeletal systems.
3.2 Analyse the effects of poor lifting techniques on the muscular and skeletal systems.
3.3 Evaluate the effects of one skeletal disease on the healthy functioning of the skeletal system.
