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 - ganoid, leptoid, placoid and cosmoid - and how they vary in structure and function. It also discusses the structure and function of fish skin, comparing it to mammalian skin. Finally, it provides details on the structure and function of skeletal muscles at the cellular level, including descriptions of sarcomeres, myofilaments, and the sliding filament model of muscle contraction.

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