BIOC32H3 : Skeletal muscle 3

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blackrabbit616

7 Mar 2011

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If a muscle is stimulated repetitively enough or at a fast enough frequency, it will ultimately fatigue and no longer be able to generate tension and contract. Muscle fatigue can occur as a result of processes in the muscle or processes at the neuromuscular junction (synapse). Within the muscle, fatigue can occur because of: glycogen depletion (glycogen being the primary source for atp production), a reduction in intracellular ph (accompanied by lactic acid buildup). The reduction in ph reduces the efficiency of enzymes and other proteins which have a ph optima at which they function best: a calcium imbalance. At the neuromuscular junction, fatigue can occur because of the depletion of the neurotransmitter, acetylcholine. The objective of the synaptic fatigue laboratory exercises is to observe and distinguish muscle fatigue due to fatigue within the muscle or fatigue within the neuromuscular junction (nmj). You first stimulate the right sciatic nerve and watch the right gastrocnemius muscle contract.

Related Questions

please give details. The phenomena and factors associated withskeletal muscle fatigue

byzantiumbear539

During muscle fatigue, the production of lactic acid

a. indicates lack of oxygen

b. accompanies alcohol formation

c. is responsible for carbon dioxide formation

d. is neccesary for glucose formation

e. occurs in the Krebs cycle

1. Muscle fibers can contract continuously for an indefiniteamount of time.

Select one:

True

False

2. Lifting a dumbell at the gymis an example of isometric contraction.

Select one:

True

False

3. During the latent period ofthe muscle contraction, neurotransmitters are introduced into thesynapse of the neuromuscular junction (the area where the nervemeets with the muscle) and actin and myosin go back to theirresting positions.

Select one:

True

False

4. The burning sensation that youget during muscle fatigue is due to the build-up of lacticacid.

Select one:

True

False

5. The reason athletes warm upbefore a game is because it increases the availability of calciumin the muscle.

Select one:

True

False

The wrist is made up of many tiny bones. What are these bonesreferred to as?

Select one:

a. carpals

b. tarsals

c. ulnar

d. radius

Which cranial bone are you touching when you put your hand onyour forehead?

Select one:

a. parietal bone

b. occipital bone

c. frontal bone

d. mandible

The patellar (knee jerk) reflex is an example of a somaticreflex.

Select one:

True

False

The phalanges are the bones found in the fingers and toes.

Select one:

True

False

10.

Which structure reduces friction within a synovial joint?

Select one:

a. articular capsule

b. synovial membrane

c. bursae

d. fibrocartilage

BIOC32H3 : Skeletal muscle 3

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