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How can caffeine cause a muscle fiber to contract andgenerate force, but without generating an end plate potential oraction potential of the membrane? What is caffeine affecting in themuscle fiber, motor neuron, or neuromuscular junction. Pleaseexplain in detail.



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Elin Hessel
Elin HesselLv2
28 Sep 2019
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Related questions

Create a list of the sequence of events that take place from theconduction of an action potential in a motor neuron axon to thecompletion of a muscle fiber twitch contraction elicited by thataction potential. Identify the membrane channels and ions or othermechanisms that are important in each step.

1. Each muscle fiber is a bundle of myofibrils. Eachmyofibril is a series of sarcomeres. Thus, a muscle fiber contractswhen each sarcomere within a series contracts simultaneously. Suchcoincidence is mirrored by each myobril within the muscle fiber.What enables the extent to which molecular motors contractsimultaneously within an innervated muscle fiber?

a. the frequency of acetylcholine secretion within theneuromuscular synapse

b. the frequency of Ca2+ oscillations within themuscle fiber

2. A living muscle fiber experiences dynamic frequencies ofCa2+ oscillations. In effect, Ca2+ acts as asecond messenger when it disperses throughout the fluid-filledspaces between actin and myosin filaments. What is the source ofthis second message?

a. extracellular fluid b.sarcoplasmic reticulum

3. Why might a muscle fiber need an ample amount ofNa+,K+-ATPase on itssurface?

a. as evident by the value of the cell’s membrane potential,muscle fibers are leaky to Na+

b. to counter the effect of numerous action potentials persecond

4. Assume that you could “see” nicotinic acetylcholine receptorswithin the musculature. How would they be arranged spatially?

a. evenly distributed on the cell’s surface like voltage-gatedNa+ and K+ channels

b. in dense arrays within the motor end plate

5. Assume that you could “see” neurosecretion fromα-motor neurons within the musculature of an animal standing still.What would this “look” like?

a. uniform, baseline secretion throughout the musculature

b. enhanced acetylcholine secretion within antigravity muscles,baseline secretion elsewhere

1.) Each motor neuron innervates a finite number of musclefibers. We have referred to this set of muscle fibers as amotor unit. Do motor units vary insize?

a.) no, they average about the same throughout themusculature

b.) yes, fine control depends upon a motor unit with onlyseveral muscle fibers

2.) The cerebellar input that defines the status of the headoriginates within the left and right

a.) motor cortex b.)vestibular apparatus

3.) How are the muscle fibers within a motor unit arrangedspatially within a muscle fascicle?

a.) adjacent to one another

b.) scattered somewhat throughout the fascicle

4.) What is the resting membrane potential of a musclefiber?

a.) -90 mV

b.) -60 mV

5.)

In view of the difference between the resting membrane potentialof a motor neuron and a muscle fiber, which cell is more leaky tosodium ions?

a.)motor neuron

b.) muscle fiber

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