In a particular neural synapse, the release of neurotransmitter causes potassium

Question

In a particular neural synapse, the release of neurotransmitter causes potassium channels to open. This would result in a depolarizing (excitatory) effect on the postsynaptic neuron. True False Compared to ionotropic receptors, metabotropic receptors usually... (choose all that apply) have faster onset of their response. show a weaker response if a similar number of receptors are activated. show a stronger response if a similar number of receptors are activated. have a slower onset of their response.

Explanation / Answer

1) False

Hyperpolarization occurs and not depolarization

Hyperpolarization is when the membrane potential becomes more negative at a particular spot on the neuron's membrane, while depolarization is when the membrane potential becomes less negative (more positive). Depolarization and hyperpolarization occur when ion channels in the membrane open or close, altering the ability of particular types of ions to enter or exit the cell. For example:

The opening and closing of these channels may depend on the binding of signaling molecules such as neurotransmitters, or on the voltage across the membrane.

2) Have a slower onset of their response

Metabotropic receptors do not have a "channel" that opens or closes. Instead, they are linked to another small chemical called a "G-protein". Once activated, the G-protein itself goes on and activates another molecule. This new molecule is called a secondary messenger.

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