Problem
1) Muscle fibers need continuous supply of ATP to function for any amount of time. First a muscle fiber will use any stored ATP - that only lasts for about 6 seconds. Once the stored ATP is used up, how does the muscle fiber make more ATP?
ATP is found/made Description
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ATP is found/made
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Description
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1. Stored ATP in muscle
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Up to 6 seconds of ATP is stored in the muscle
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2) Which of the above methods of synthesizing ATP requires oxygen? Electron transport system
3) (Review) How many ATP are produced per molecule of glucose during cellular respiration? up to 36 molecules of ATP
Describe fast vs. slow twitch muscle fibers:
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Type of Fiber
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Uses Oxygen? Y/N
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Steady Power or Explosive?
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Fatigues easily or has endurance?
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Lots of capillaries or few?
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Lots of myoglobin or not?
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Fast Twitch
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Slow Twitch
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Read the section on Muscular Homeostasis
Think about this: Based on what you know about muscle contraction, think of how this process would work: Botulism toxin is produced by the Clostridium botulinum bacteria, and it prevents the release of acetylcholine. What happens to the facial muscles when people inject purified botulism toxin (BOTOX) into their face?
Another Think about it: Sarin gas is a potent nerve gas that inhibits an enzyme called acetylcholinesterase. This enzyme normally breaks down acetylcholine after it has been released into the synapse, allowing muscles to relax. When exposed to Sarin gas, people die very quickly of respiratory and cardiac distress. Why?