Synapses

Presynaptic membrane

• Cell body

• axon terminal

• dendrite

• dendron

Another name for a nerve impulse is

• Electrical signal

• Action potential

• Neurotransmitter

• Axon terminal

Which letter represents a neurotransmitter?

Which letter represents a vesicle?

Which letter represents a neurotransmitter receptor?

Which letter represents a voltage-gated calcium channel?

Which number represents the post-synaptic membrane?

Which number represents the synaptic cleft?

What happens in an axon terminal when an action potential arrives at the presynaptic membrane?

• sodium ions diffuse in

• sodium ions diffuse out

• calcium ions diffuse in

• calcium ions diffuse out

What happens when calcium ions diffuse into an axon terminal?

• vesicles release neurotransmitter by exocytosis

• voltage-gated sodium channels open

• voltage-gated sodium channels close

• neurotransmitter is pumped from the post-synaptic membrane