Which of the following statements about a chemical synapse is true?

 

1) Signal transmission occurs by diffusion of a compound called a neurotransmitter through the intercellular space between neurons.

2) Calcium ions relay the signal generated by an action potential in one neuron across the gap to a second neuron.

3) It allows signal transmission from one neuron to another through a wave of electrochemical change.

4) Its presynaptic component undergoes chemical breakdown in response to a signal, and the breakdown product carries the signal to the postsynaptic component.

Answer= 1) Signal transmission occurs by diffusion of a compound called a neurotransmitter through the intercellular space between neurons.

A chemical synapse is a space bordered by two neurons through which electrical signals must flow from side to side. Neurotransmitters are mobile molecules that appear to be responsible for transient messages between neurons and across synapse boundaries. They usually flow across the intercellular spaces bordered by neurons and form a bridge of various kinds flanked by two neurons separated by a gap. The signals that must be sent have direct access to the next or target neuron.

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