KNES 464 Lecture Notes - Lecture 2: Carbohydrate, Myofibril, Mitochondrial Matrix
16 Oct 2018
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What is the name of the molecuile that cells utilize to do work: atp. What happens when you break down atp: adp and pi and energy. At onset of exercise all three systems are turned on. Dominates atp resyntheis: time- 10-60 seconds, distance 200-400 meters. As soon as muscle contraction starts, this process also begins. Breakdown of gluclose and glycogen (storage form of glucose) to lactic acid: readily available source of fuel in skeletal muscle. Does not require oxygen (fast atp pathway) Glucose gets uptaken into the cytosol and made into g-6-p and then made into either pyruvate or lactate (pyruvate is easily made into lactate in anaerobic glycolysis) Domatinates atp resyntheisis: time: 60+ seconds, distance: 800+ meters. Exercises beyond 60 secondsusually reqiues aerobic glycolysis. Complete oxidation gof typically glucose and fatty acids to co2 and h2o. Rate of glycogen and fat utliziation vaies according to running seped. Marathon: glycogen utilization rate low, but durinatio nlong.
