Nerve impulse

Nerve cells receive stimuli and they convert them to electrical ________________

What is a nerve impulse

• the main body of the nerve cell

• the dendrites of the nerve cell

• an electrical current

The resting membrane potential is:

• +40mV

• -70mV

• -20mV

• 0 mV

Which ions are MAINLY implicated in the potential of the membrane?

• Na and Ca

• Ca and Fe

• K and Cl

• Na and K

During an action potential the membrane potential goes from the resting potential (typically -70 mV) to some positive value (typically about ________) in a very short period of time (just a few milliseconds).

Membrane potential is:

• positive during resting and negative during action

• negative during resting and positive during action

• always negative

• always positive

part of a neuron that receives information from other neurons

• axon
• dendrites
• myelin sheath
• synapse

a signal molecule that transmits nerve impulses across synapses

• neuron
• neurotransmitter
• nerve
• action potential

When a neuron is depolarized, what are the first channels to open?

• Sodium
• Potassium
• Calcium
• ACTH

When a neuron is resting, the inside of the axon has a ____________ charge.

• positive
• negative