In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles .
Reason : Chemicals enter the cell through receptor.
Answer & explanation
Correct answer: option 4
Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles.Chemical messages are transmitted to specific receptors through the extracellular fluids or across the synaptic gap.
These chemical messengers interact with receptors without entering the cell and change the shape of receptor and deliver the message.