Sympathetic, Parasympathetic and Enteric Nervous Systems

The book delves into the intricacies of the autonomic nervous system, highlighting the roles of the sympathetic (SNS), parasympathetic (PNS), and enteric nervous systems (ENS) in regulating unconscious bodily functions. It explains how SNS triggers the fight-or-flight response through neurotransmitters like acetylcholine and norepinephrine, affecting heart rate and blood pressure, among other functions. The text also explores the connection between the nervous system and immune responses, detailing the impact of the brain on both innate and adaptive immunity.