a physiologically muscle and an isometric contraction have onething in common;they both do no mechanical work. in terms ofmyofilament tension, explain the difference between these twostates.

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Deanna HettingerLv2

28 Sep 2019

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Draw a concept map with lines to show the connections between each of the following words as they connect within the body. The purpose of this assignment is to facilitate your understanding of the integrated nature of physiological processes in the body at rest and during exercise. You must include, but are not limited to, the following terms in your map. *All terms must have at least one connection, and all connections must have an explanation:

Cardiac Muscle

Skeletal Muscle

Actin

Myosin

Motor Unit

ATP

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Concentric

Isometric

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5) You are given an isolate muscle with its motor nerve intact. This preparation is arrange so that you can make electrophysiological measurements from the nerve and the muscle as well as mechanical measurements of the muscle contraction. You observe that if caffeine is added to the fluid bathing the preparation, the peak tension developed in a muscle twitch produced by stimulating the motor nerve is increased. a. List the possible locations where caffeine may be exerting its effect. b. Caffeine is known to alter transmembrane movement of Ca2+. What is (are) the possible sites(s) at which caffeine is acting? c. High concentration of caffeine causes an isolate muscle to contract in the absence of any activity in the motor nerve. This contraction is not blocked by nicotinic blocking agents like curare. Where do you think caffeine acts?

rubytortoise93

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.)