Electrical signals in the body (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the resting potential of a nerve cell?
What is the resting potential of a nerve cell?
mV
Where is the sodium ion concentration highest in a resting nerve cell?
Where is the sodium ion concentration highest in a resting nerve cell?
Outside the cell
What potential difference is reached during depolarisation of a nerve cell?
What potential difference is reached during depolarisation of a nerve cell?
mV
Which ions flow into the cell during depolarisation?
Which ions flow into the cell during depolarisation?
Sodium ions
What happens during repolarisation of a nerve cell?
What happens during repolarisation of a nerve cell?
Potassium ions leave the cell
How long can nerve fibres extend in the human body?
How long can nerve fibres extend in the human body?
Up to a metre
How does depolarisation time in heart muscle compare to nerve cells?
How does depolarisation time in heart muscle compare to nerve cells?
About 40 times longer in heart muscle
What structure controls the heart's electrical impulses?
What structure controls the heart's electrical impulses?
A natural pacemaker node
What term describes a cell maintaining its resting potential?
What term describes a cell maintaining its resting potential?
Polarised
What triggers the opening of potassium channels during an action potential?
What triggers the opening of potassium channels during an action potential?
Membrane potential reaching mV