CHEM 1004 Chapter Notes - Chapter 5: Sympathetic Nervous System, Asthma, Angina Pectoris

• School: Carleton University
• Department: Chemistry
• Course: CHEM 1004
• Professor: Gerald Buchanan

Document Summary

Synapse - the free space between neurons. Motor neurons - involved in movement or muscle activity. Axons - conduct the impulse to the next cell. (nerve impulses only move in one direction) Ganglions - collections of nerve cells and synapses concentrated in one location for easy interconnection and crossover. Preganglionic fibres lead up to the ganglion and postganglionic nerve fibres lead impulses away from the ganglion. Transmissions are terminated when there is an enzymatic reaction of the transmitter molecule or with the expenditure of energy to release it from its binding point. 6 important neurotransmitters: = 2 really important. Acetylcholine - the transmitter in nerves that slow the heart, control the use of voluntary muscles, constrict involuntary muscle, and keep central nervous system working. Does not circulate in blood and is preganglionic. Epinephrine (adrenaline) and norepinephrine - both neurotransmitters but epinephrine is effective at lower concentrations. Norepinephrine (noradrenaline) - released to stimulate heart contractions.