Test Your Knowledge on Excitable Cells and Action Potentials

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Questions and Answers

What is depolarization?

When the inside of the cell becomes more negative

When the outside of the cell becomes more negative

When the inside of the cell becomes less negative (correct)

When the outside of the cell becomes less negative

What is depolarization?

When the inside of the cell becomes more negative

When the outside of the cell becomes more negative

When the inside of the cell becomes less negative (correct)

When the outside of the cell becomes less negative

Which of the following is a macronutrient essential for microbial growth?

Sodium (correct)

Iron

Copper

Zinc

What are graded potentials?

Small, transient changes in membrane potential proportional to the stimulus. Signup and view all the answers

What are graded potentials?

Small, transient changes in membrane potential proportional to the stimulus Signup and view all the answers

What is the term used to describe the amount of water available for microbial growth?

Water activity Signup and view all the answers

What produces depolarizing graded potentials?

Excitatory stimuli. Signup and view all the answers

What produces hyperpolarizing graded potentials?

Inhibitory stimuli Signup and view all the answers

Which type of solution affects water movement and can have an impact on microbial growth?

Isotonic Signup and view all the answers

What is the threshold?

The value that the depolarizing graded potential must reach to trigger an action potential. Signup and view all the answers

What is the threshold for an action potential?

The value that the depolarizing graded potential must reach to trigger an action potential Signup and view all the answers

What is the depolarizing phase of an action potential?

Between threshold and the peak of the action potential Signup and view all the answers

What is the depolarizing phase?

The phase between threshold and the peak of the action potential. Signup and view all the answers

What is repolarization?

When the membrane potential returns to the resting state after an action potential Signup and view all the answers

What is repolarization?

When the membrane potential returns to the resting state after an action potential. Signup and view all the answers

What is hyperpolarization?

When the inside of the cell becomes more negative than the resting state Signup and view all the answers

What is the undershoot in an action potential called?

The hyperpolarizing phase Signup and view all the answers

Study Notes

Excitable cells are polarized with a negative inside and different outside.
Depolarization is when the inside of the cell becomes less negative.
Graded potentials are small, transient changes in membrane potential proportional to the stimulus.
Depolarizing graded potentials are produced by excitatory stimuli and hyperpolarizing graded potentials are produced by inhibitory stimuli.
Action potentials are large, fast changes in membrane potential elicited by a large excitatory stimulus.
Threshold is the value that the depolarizing graded potential must reach to trigger an action potential.
The depolarizing phase is between threshold and the peak of the action potential.
Repolarization is when the membrane potential returns to the resting state after an action potential.
Hyperpolarization is when the inside of the cell becomes more negative than the resting state.
The undershoot in the action potential is called the hyperpolarizing phase.

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Description

"Test your knowledge of neuronal physiology with our Excitable Cells and Action Potentials Quiz! Explore the concepts of polarization, depolarization, graded potentials, and action potentials, as well as the different phases of an action potential. Learn about threshold, repolarization, and hyperpolarization, and understand how these processes contribute to the functioning of the nervous system. Put your understanding to the test and see how much you know about the electrical signals that govern our bodies!"