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Neural & Muscular Excitability Quest

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Neural & Muscular Excitability Quest

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About this activity

Test your understanding of nerve and muscle basics

Created by

Wilmeris Iriartes
Wilmeris Iriartes
Venezuela

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Neural & Muscular Excitability Quest
 

Neural & Muscular Excitability QuestOnline version

Test your understanding of nerve and muscle basics

by Wilmeris Iriartes
1

What ion channels cause depolarization in a neuron when opened by voltage change?

2

Where does a depolarization jump occur in myelinated axons, enabling rapid propagation?

3

Which neurotransmitter is released at the neuromuscular junction to trigger contraction?

4

What is a motor unit?

5

What does the Na+/K+ pump accomplish per cycle?

6

What initiates the muscle contraction cycle at the sarcomere?

7

How do myelinated fibers differ in speed of conduction compared to unmyelinated?

8

What type of transmission typically occurs at a synapse to pass the signal?

9

What is the role of troponin in muscle contraction?

10

Which receptor type is primarily involved at the neuromuscular junction?

Explicación

Sodium channels open in response to voltage changes, driving depolarization.

Nodes of Ranvier are gaps in myelin where action potentials are regenerated.

Acetylcholine binds nicotinic receptors to stimulate muscle contraction.

A motor unit comprises a motor neuron and the fibers it controls.

The pump exports 3 sodium and imports 2 potassium, creating a net outward positive current.

Calcium binds to troponin, moving tropomyosin to expose myosin-binding sites.

Saltatory conduction in myelinated fibers speeds up impulse transmission.

Most synapses operate chemically with neurotransmitters crossing the synaptic cleft.

Calcium-bound troponin shifts tropomyosin to uncover actin-myosin binding sites.

The nicotinic receptor at the NMJ mediates fast excitatory transmission.

 
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