Question

37. Excitatory neurotransmitters released into synapse can stimulate depolarization currents in the terminal buttons of post-synaptic cell. If the excitatory signal is strong, the depolarizing currents generated can add up on top of one another, generating a current of higher magnitude. This process is referred to as summation, and the post-synaptic potential is referred to as graded potential. Action potential is an all-or-none response. Since it is usually generated at axon hillock and travels down a single axon, summation will not occur and it is not graded. (A6) (a) Use the information give, how would the action potential relay signals of different strength? Which channel on the neuron membrane allow this to occur? (b) Not all neurons generate action potential, for instance, photoreceptor neurons in the retina of human eyes only generate graded potential. How do you think this benefit the phototransduction pathway?

          37. Excitatory neurotransmitters released into synapse can stimulate depolarization currents in the terminal buttons of post-synaptic cell. If the excitatory signal is strong, the depolarizing currents generated can add up on top of one another, generating a current of higher magnitude. This process is referred to as summation, and the post-synaptic potential is referred to as graded potential. Action potential is an all-or-none response. Since it is usually generated at axon hillock and travels down a single axon, summation will not occur and it is not graded. (A6)

(a) Use the information give, how would the action potential relay signals of different strength? Which channel on the neuron membrane allow this to occur?

(b) Not all neurons generate action potential, for instance, photoreceptor neurons in the retina of human eyes only generate graded potential. How do you think this benefit the phototransduction pathway?

37. Excitatory neurotransmitters released into synapse can stimulate depolarization currents in the terminal buttons of post-synaptic cell. If the excitatory signal is strong, the depolarizing currents generated can add up on top of one another, generating a current of higher magnitude. This process is referred to as summation, and the post-synaptic potential is referred to as graded potential. Action potential is an all-or-none response. Since it is usually generated at axon hillock and travels down a single axon, summation will not occur and it is not graded. (A6)

(a) Use the information give, how would the action potential relay signals of different strength? Which channel on the neuron membrane allow this to occur?

(b) Not all neurons generate action potential, for instance, photoreceptor neurons in the retina of human eyes only generate graded potential. How do you think this benefit the phototransduction pathway?

Added by Ivan D.

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