Discuss what defines a chemical as a ‘neurotransmitter’ or a ‘hormone’

Discuss what defines a chemical as a ‘neurotransmitter’ or a ‘hormone’. Give detailed examples to support your point. Also show examples where the same chemical can be either. 5. Discuss why the following affect the rate of diffusion: molecular size, temperature, and solution density. Give appropriate examples to support your discussion. 6. Compare the sequence of events that are involved in activation of alpha and with beta receptors.