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IB Biology: C2.2-Nerve Impulses as Action Potentials

IB Biology: C2.2-Nerve Impulses as Action Potentials

Assessment

Flashcard

Biology

12th Grade

Practice Problem

Hard

Created by

Herbert Asiedu-Mante

FREE Resource

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7 questions

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1.

FLASHCARD QUESTION

Front

What is an action potential?

Back

An action potential is the sudden, rapid reversal of the potential difference across the axonal membrane from -70mV to +30mV. It is also known as a nerve impulse.

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2.

FLASHCARD QUESTION

Front

Why are nerve impulses considered electrical?

Back

Nerve impulses are electrical because they involve the movement of positively charged ions.

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3.

FLASHCARD QUESTION

Front

How is a stimulus processed in the nervous system?

Back

A stimulus is picked up by a sensory receptor and transferred to the dendrites of a sensory neuron. The impulses then travel from the dendrites to the cell body, and from the cell body to the axon and the terminals.

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4.

FLASHCARD QUESTION

Front

What is the role of action potentials in nerve fibres?

Back

Nerve impulses are action potentials that are propagated along nerve fibres.

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5.

FLASHCARD QUESTION

Front

How is an action potential generated?

Back

An action potential is generated when the resting membrane potential of a neuron rises from -70 mV to +30 mV.

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6.

FLASHCARD QUESTION

Front

What is depolarisation?

Back

Depolarisation is the sudden change in membrane potential across the inner and outer membrane from -70 mV to +30 mV. It is also called an action potential.

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7.

FLASHCARD QUESTION

Front

What is repolarisation?

Back

Repolarisation is the restoration of a membrane potential following depolarisation, restoring it back to -70 mV from +30 mV.

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