PSYB65H3 Chapter Notes - Chapter 5: Hand Washing, Molecular Modification, Mania
Document Summary
Chapter 5: how do neurons use electrochemical signals to. The basis of neural communication in a heartbeat. Heart rate changes to match energy expenditure to meet the body"s nutrient and oxygen needs. Bradycardia = when your heart rate nearly stops when you go underwater to conserve the body"s oxygen when you are not breathing. Otto loewi was the first to isolate a chemical messenger. Epinephrine and norepinephrine excite the heart in humans. Acetylcholine (ach): first neurotransmitter discovered in the peripheral and central nervous systems; activates skeletal muscles in the somatic nervous system and may either excite or inhibit internal organs in the autonomic system. Epinephrine (ep, or adrenaline): chemical messenger that acts as a hormone to mobilize the body for fight or flight during times of stress and as a neurotransmitter in the central nervous system. Norepinephrine (ne, or noradrenaline): neurotransmitter found i the brain and in the sympathetic division of the autonomic nervous system; accelerates heart rate in mammals.
