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Higher Human Biology

Higher Human Biology. Unit 1 Human Cells. KEY AREA 8: Energy Systems in muscle cells. Human Cells Learning Intentions. KEY AREA 8 – Energy Systems Energy Systems in muscle cells Lactate Metabolism (Fermentation) Types of Skeletal Muscle Fibres. 8a) Lactate Metabolism (Fermentation).

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Higher Human Biology

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  1. Higher Human Biology Unit 1 Human Cells KEY AREA 8: Energy Systems in muscle cells

  2. Human Cells Learning Intentions KEY AREA 8 – Energy Systems • Energy Systems in muscle cells • Lactate Metabolism (Fermentation) • Types of Skeletal Muscle Fibres

  3. 8a) Lactate Metabolism (Fermentation) During vigorous exercise, cells start to respire anaerobically because they do not receive an adequate supply of oxygen from the blood to support the electron transport chain During fermentation, the only stage of respiration that can occur is Glycolysis In Glycolysis in fermentation Glucose  Pyruvate Lactate This conversion involves the transfer of hydrogen from NADH to produce lactate NAD is regenerated, meaning that ATP production through glycolysis can continue Lactate gathers in muscle cells and causes fatigue and an oxygen debt builds up The oxygen debt gets repaid when exercise comes to a halt, and energy made from Aerobic Respiration is used to convert lactate back to pyruvic acid and glucose in the liver

  4. 8b) Lactate Metabolism (Fermentation)

  5. Body movements are brought about by the action of skeletal muscle fibres Skeletal muscle fibres fall into two categories based on the duration of their twitches Most human muscle tissue contains a mixture of both slow and fast twitch muscle fibres 8c) Types of Skeletal Muscle Fibres

  6. Human Cells Questions KEY AREA 8 – Energy Systems • Testing Your Knowledge 2 Page 116 Q’s 1-4 2. What You Should Know Page 117 • Quick Quiz

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