What are the specialized features of a muscle fibre? (5)

Multinucleated = fibres form from the fusion of individual muscle cells Many mitochondria = muscle contraction needs a lot of ATP usage Sarcoplasmic reticulum = internal membrane network is specialized to store calcium ions (Ca 2+) Sarcolemma = continuous membrane which has invagination (inside out pouches) for depolarisation (T tubules) Myofibrils = causes contraction, are made of actin and myosin myofilaments (striated)