PSY100H1 Chapter Notes - Chapter 5: Calcitonin Gene-Related Peptide, Dopaminergic, Mesolimbic Pathway

• School: UTSG
• Department: Psychology
• Course: PSY100H1
• Professor: Zachariah Campbell

Document Summary

Otto loewi identified the chemical that communicates a message to inhibit or slow a frog"s heart as acetylcholine (ach: the chemical that carries an excitatory message to speed up frog heart rate is. Groups of neurons that release a chemical neurotransmitter of a certain type are named: ex. neurons that release ach are called acetylcholine neurons or cholinergic epinephrine (ep) after that neurotransmitter neurons. Neurons that release ep are called epinephrine neurons. In mammals, a closely related neurotransmitter, norepinephrine (ne) also called noradrenaline, replaces ep as the excitatory neurotransmitter in noradrenergic neurons. Walter cannon demonstrated that cholinergic neurons and noradrenergic neurons play complementary roles in controlling many bodily functions in the ans: they constitute chemical systems that produce widespread and coordinated influences on behaviour, coined the phrases: Rest and digest summarizing the collective inhibitory actions of acetylcholine neurons in the parasympathetic ans. Fight or flight summarizing the collective excitatory actions of noreppinephrine neurons in the sympathetic ans.