Nerve Impulses

Which ions are involved in establishing the resting potential?

• sodium ions

• calcium ions

• potassium ions

• hydrogen ions

Which process(es) is(are) involved in establishing the resting potential?

• diffusion

• facilitated diffusion

• active transport

• osmosis

The inside of a neurone is negatively charged when at resting potential.

• True

• False

Which ions 'leak' out of neurones to establish resting potential?

• sodium ions

• potassium ions

• hydrogen ions

• chloride ions

Which term is used to describe the change in the membrane potential to positive as sodium ions enter a neurone?

(a)  

Which is true for repolarisation?

• sodium channels open, potassium channels close

• sodium channels open, potassium channels open

• sodium channels close, potassium channels open

• sodium channels close, potassium channels close

Which of the following increase the speed of transmission of a nerve impulse?

• presence of myelin sheath

• smaller diameter of axon

• increased temperature

What has to be reached before a neurone can fully depolarise?

• threshold potential

• refractory period

• hyperpolarisation

• resting potential

What value is the resting potential in mV (number and sign only)?

(a)  

Tags

NGSS.HS-PS2-5

What is saltatory conduction?

• when the threshold potential is reached

• when the action potential jumps from node to node

• when the neurone becomes hyperpolarised