Fast and Slow muscle fibres 0.0 / 5 ? BiologyMuscle ContractionA2/A-levelAQA Created by: Jasmine KhatriCreated on: 19-06-16 11:48 What is the role of phosphocreatine (PCr)? It provides phosphate to make ATP. 1 of 11 How does PCr form ATP? ADP is phosphorylated using the phosphate from PCr. PCr is stored in cells and ATP-PCr system creates ATP v quickly. 2 of 11 How long does PCr last? Only a few seconds - so it's used for short bursts of vigorous excercise e.g. tennis serve. 3 of 11 Characteristics of fast muscle fibres (1) Contract very quickly and powerfully over a short duration of time. E.g. in biceps. 4 of 11 Characteristics of fast muscle fibres (2) Large store of PCr used to quickly generate ATP. 5 of 11 Characteristics of fast muscle fibres (3) High concentration of enzymes involved in anaerobic respiration. 6 of 11 Characteristics of fast muscle fibres (4) Thicker and more numerous myosin fibres. 7 of 11 Characteristics of slow muscle fibres (1) Contract more slowly and provide less powerful contractions over a longer period of time. E.g. weight-lifting. 8 of 11 Characteristics of slow muscle fibres (2) Large store of myoglobin (which stores oxygen). 9 of 11 Characteristics of slow muscle fibres (3) Rich supply of glycogen to provide source of energy and blood vessels to deliver O2 and glucose. 10 of 11 Characteristics of slow muscle fibres (4) Many mitochondria to produce ATP. 11 of 11
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