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Title: A2 Level (Unit 5) Muscle Fibres Question and Answers
Description: A2 Level Biology. Unit 5- Energy, Exercise, Coordination Muscle Fibre Section Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology. Unit 5- Energy, Exercise, Coordination Muscle Fibre Section Really easy, fast and effective revision resource. Questions and Answers!
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Unit 5 – Energy, Exercise and Coordination
MUSCLE FIBRE:
Structure of a muscle fibre:
-Numerous myofibrils which are made up of a series of sarcomeres
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-Just Actin filaments appear as a light band on the sarcomere
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-Where both myosin and actin filaments appear an intermediate-coloured band is formed
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SLOW TWITCH MUSCLE FIBRES:
What are characteristics of the slow titch muscle fibre?
-They have many mitochondria
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-They have large amounts of the myoglobin (red)
-They little sarcoplasmic reticulum
-They have a low glycogen content
-They have numerous capillaries
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FAST TWITCH MUSCLE FIBRES:
What are characteristics of the fast twitch muscle fibres?
-They have few mitochondria
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-They have very little myoglobin (white)
-They have extensive sarcoplasmic reticulum
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-They have few capillaries
-They fatigue quickly due to more lactate build up
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(ER is a system of membrane bound sacs
around the myofibrils
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What is the sarcoplasm?
-It is the name given to cytoplasm in a muscle cell
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What happens as a result?
-The tropomyosin on the actin filament shifts its position
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What do the myosin heads bind with and what does this form?
-They bind with the myosin binding sites in the actin filament
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What happens when the myosin heads bind to the actin?
-ADP and Pi on the myosin head are released
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What does this movement result in?
-The relative movement of the filaments; the attached actin moves over the myosin
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-It returns to its upright position which enables the cycle to start again
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-Calcium ions are actively pumped out of the muscle sarcoplasm, using ATP
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Title: A2 Level (Unit 5) Muscle Fibres Question and Answers
Description: A2 Level Biology. Unit 5- Energy, Exercise, Coordination Muscle Fibre Section Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology. Unit 5- Energy, Exercise, Coordination Muscle Fibre Section Really easy, fast and effective revision resource. Questions and Answers!