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Neuronal Action Potential Principles Quiz

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Neuronal Action Potential Principles Quiz

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Questions and Answers

What causes the downswing/repolarisation of the neuron?

The movement of sodium ions inside the cell
The number of neurons fired
The stimulus intensity affecting the neuron
Opening of little holes to let potassium out (correct)

What is the purpose of the refractory period in a neuron?

To activate the all-or-none principle
To bring the cell back to its resting potential (correct)
To release potassium ions from the cell
To conduct more voltage

How do myelin sheaths affect neural transmission?

They cause saltatory conduction, allowing faster transmission (correct)
They prevent the movement of ions in and out of the neuron
They trigger the refractory period
They slow down neural transmission

How are glial cells different from neurons?

Glial cells do not transmit information as neurons do (C) Signup and view all the answers

What is the main function of dendrites in a neuron?

Receiving information from other neurons and relaying it to the cell body (B) Signup and view all the answers

What is the role of the myelin sheath in a neuron?

Insulating the axon to make information move faster (A) Signup and view all the answers

What is the significance of the resting potential in a neuron?

It maintains a more negative charge inside the neuron than outside (A) Signup and view all the answers

What triggers an action potential in a neuron?

The opening of little holes in the cell membrane, allowing sodium to enter (C) Signup and view all the answers

Why is the brain folded?

To maximize the capacity of neurons the brain can hold (A) Signup and view all the answers

What is the difference between a sulcus and a gyrus?

Gyri are flat surfaces on the brain, while sulci are small indents (D) Signup and view all the answers

What did silver nitrate have to do with Golgi and Ramon y Cajal’s work on neurons?

It was used to visualize and stain cells black, allowing them to observe neurons for the first time (D) Signup and view all the answers

What was Golgi and Ramon y Cajal’s key insight about neurons?

Neurons in the brain are responsible for mental processing (B) Signup and view all the answers