BIOB32H3 Lecture Notes - Myocyte

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cerisealligator589

8 May 2012

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Document Summary

Proximal is the waist where the stimulator is. The distal end is the knee joint where te receptor is. This was used in the frog nerve experiment. The tendon ( ankle) is attached to the needle pen. All the weights are used in the part ii. Increase the voltage until you see the first twitch. The needle pen draws the first bump on the revolving graph. You measure the amplitude of the peak /bump: so first graph: amplitude vs voltage you keep incraseing the voltages until the ampliteu of the peak doesn"t change anymore. Need to make sure that all the motor units are firing by keeping at maximal voltage setting. Use the frequency setting ( maximal voltage setting ) on the stimulator , and increase frequencing setting knob. 2 each cluster refers to one frequency ( 1hz, 2hz) The pen is drawed ( dipped) , under the stretched condition what you see is that.

Related Questions

You decide to run an experiment in the lab in which you stimulate a neuron two times. If you wait 10 ms between the two stimulations, you can record normal action potentials each time. A. If you only wait 2 ms between stimuli, you are unable to record a second action potential using the same stimulus that caused the first action potential. To remedy this, you apply a larger stimulus to the neuron and are once again able to record action potentials. Name and explain this phenomenon. B. If you switch to a 1 ms interval between stimuli, even increasing the amplitude of the second stimulus does not elicit an action potential. Why is this the case?

Given: A gastrocnemius muscle at its optimallength, when maximally stimulated by a single electrical stimulus,produces an isometric twitch tension of 80kg, and consumes 5 joulesof energy above its basal energy consumption (measured by acalorimeter-includes all the energy used by the muscle as a resultsof that stimulus). If you then stretch the muscle (hyper-extend it)so that the same maximal electrical stimulus produces no twitchtension at all, stimulating the muscle raises its energyconsumption by only 1 joule above its basal energy consumption(measured again with the calorimeter).

The 5 joules of energy consumed by the muscle during a maximalstimulus at optimal length were used for what? Be specific.
The 1 joule of energy consumed by the muscle during a maximalstimulus at hyper-extended length was used for what? Bespecific.
Explain the difference in amplitude of the twitch tensionbetween optimal length and hyper-extended length. Be specific.

(Please don't think I'm being aggressive, the "be specific" partis included in the questions.)