Synaptic Transmission

The conversion of signal at postsynaptic membrane is

• Electrical signal to chemical signal

• Chemical signal to electrical signal

• Potential signal to electrical signal

• Potential signal to chemical signal

Answer explanation

At the postsynaptic membrane, neurotransmitters (chemical signals) bind to receptors, leading to changes in membrane potential, thus converting chemical signals into electrical signals. Hence, the correct answer is 'Chemical signal to electrical signal'.

What is most likely to happen if a post-synaptic neuron is depolarized? Hyperolarized?

• Depolarized- becomes more positive, action pot more likely

  Hyperpolarized- becomes very negative, action pot less likely

• Depolarized- becomes more negative, action pot less likely

  Hyperpolarized- becomes very positive, action pot more likely

Answer explanation

When a post-synaptic neuron is depolarized, it becomes more positive, increasing the likelihood of an action potential. Conversely, if it is hyperpolarized, it becomes very negative, making an action potential less likely.

Tags

NGSS.HS-LS1-3

Which of these is a FALSE statement about neurotransmitters?

• They act as chemical messengers

• They can be inhibitory

• They can be excitatory

• Glucose is an example

Answer explanation

Glucose is not a neurotransmitter; it is a sugar that provides energy to cells. Neurotransmitters are specific chemical messengers that can be excitatory or inhibitory, such as dopamine or serotonin.

A chemical synapse requires _________ for an impulse transmission.

• Gap Junction

• Neurotransmitter

Area labelled 'A' in the figure is called:

• Synaptic Knob

• Synaptic Cleft

• Synaptic Chamber

• Gap Junction

'B' in the figure is an example of

• thermo-sensitive channel

• voltage-gated channel

• mechano-gated channel

• ligand-gated channel

Regarding the mechanism (the sequence of events) of synaptic transmission in a chemical synapse:

1. ______ ______ arrives at the presynaptic terminal/ synaptic knob.

(a)  

Regarding the mechanism (the sequence of events) of synaptic transmission in a chemical synapse: Induces the opening of ______-gated _______ channel at the synaptic knob causes influx of the ion.

(a)  

Regarding the mechanism (the sequence of events) of synaptic transmission in a chemical synapse: The influx of _______ induces the fusion of vesicles containing __________ at the membrane of the presynaptic terminal.

(a)  

Regarding the mechanism (the sequence of events) of synaptic transmission in a chemical synapse:

4. __________ causing depolarization of postsynaptic terminal.

• EPSP neurotransmitter

• IPSP neurotransmitter