MCQ A.4.2. – BasicPhysiology.org

Created on April 09, 2023 By

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MCQ A.4.2.

The Motor End Plate – MCQ’s

1 / 6

The function of curare-mimetica during a major surgery is:

To make the patient unconscious

To stop the patient’s heart

To stop the patient’s breathing

To stop the activity of all skeletal muscles in this patient

To stop the activity of all smooth muscles in this patient

2 / 6

When someone is poisoned by curare, that person will die. Why?

The heart stops beating

The lungs stop breathing

The kidney stops filtrating

The blood vessels collapse

The nerves in the brain get paralyzed

3 / 6

The transmission of an action potential across a motor end plate takes time. Which step in the sequence of this transmission is the slowest?

Exocytosis of ACh in the pre-synaptic membrane

Diffusion of ACh to the post-synaptic membrane

Coupling of ACh to an ROC

Generation of the generator potential

Breaking down of ACh by acetylcholinesterase

4 / 6

What is the correct order in action potential transmission across a motor end-plate?

calcium-influx – exocytosis – ACh diffusion – coupling of ACh to ROC – generator potential

ACh diffusion – calcium-influx – coupling of ACh to ROC – generator potential

calcium-influx – exocytosis – coupling of ACh to ROC – ACh diffusion – generator potential

calcium-influx – coupling of ACh to ROC – exocytosis – ACh diffusion – generator potential

calcium-influx – exocytosis – generator potential – ACh diffusion – coupling of ACh to ROC

5 / 6

The post-synaptic membrane in a motor end plate is often folded. Why is this useful?

It increases the area and therefore the number of vesicles that may leave the pre-synaptic membrane.

It increases the area and therefore the number of ROC’s located in the post-synaptic membrane

It increases the area and therefore the number of VOC’s located in the post-synaptic membrane

It is useful to delay destruction by acetylcholinesterase thereby increasing the working time of acetylcholine

It prolongs the diffusion time for acetylcholine thereby inducing a longer generator potential

6 / 6

How many motor-endplates are located in one skeletal muscle cell?

none

Your score is

The average score is 54%

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