Created by alexlpeart
about 11 years ago
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Question | Answer |
Describe a method of measuring the levels of ATPase in different muscle fiber types. | ATPase is pH sensitive. We put the fiber into either alkaline or acid conditions. Fast myosin is active in alkaline solution so the ATPase is active and therefore will take up the fluorescent dye we place in the solution. The darker the dye the greater the activity of ATPase and therefore we can determine fiber type. |
Fat fibers are smaller/larger than slow twitch fibers | Larger |
In oxidative muscle fibers, what enzymes would we expect to find that indicate the muscle is aerobic? | Succinate dehydrogenase, citrate synthase and increased mitochondria numbers. |
What enzymes would we expect to find in glycolytic muscle fibers? | Phosphorylase, pyruvate kinase |
All motor units have the _____ motor units under their control. | Same |
How can we increase the force of our muscles over a very short period of time? i.e. isn't due to adaption | Recruiting more motor units and therefore more fiber |
how many fibers are there per motor unit? How many motor units do we have per muscle? | 100-200 fibers 15-50 motor units |
Muscle strength depends on ________ and not fiber type. | Cross sectional area |
What is the muscles speed of contraction based on? | Rate of cross bridge cycling, which is dependent on ATPase activity, which is dependent on the myosin heavy chain isoforms. |
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