The document summarizes key aspects of fish skin and scales as well as skeletal muscles. It describes the main types of scales found in fish like ganoid, leptoid, placoid and cosmoid scales, and how they can vary in size and structure between species and sexes. The functions of scales and skin are outlined. Skeletal muscles are described including muscle fiber anatomy, sarcomere structure, sliding filament model of contraction, and how nerves stimulate muscles via the neuromuscular junction and motor units.

22. Comparison of Fish and Mammalian skin

34. d) myofibril c) muscle fibre b) muscle fibre bundle a) Muscle belly Components of skeletal muscle

41. Neuromuscular Junction Figure 9.7 (a-c)

43. Motor Unit: The Nerve-Muscle Functional Unit Figure 9.12 (a)

47. Any questions …….. Don’t shy