PSY397H1 Lecture Notes - Phosphatidylinositol, Skeletal Muscle, Peripheral Nervous System
Document Summary
11 the nervous system: autonomic and motor systems. Its functions occur at a subconscious level when needed. The autonomic nervous system innervates most effector organs and tissues in the body. Both branches of the autonomic system innervate most organs (dual innervation) but their functions are opposite in nature (opposite effects). The parasympathetic nervous system is active during resting conditions, when it stimulates the digestive organs, and inhibits cardiovascular system. The sympathetic nervous system is most active during periods of excitation or physical activity, when it coordinates a group of physiological changes (fight-or-flight response) that prepares the body to cope with threatening situations. The primary function is to regulate the function of effector organs so as to maintain homeostasis. At rest, both are active, but the parasympathetic nervous system dominates. When the body is excited or stressed, sympathetic nervous system dominates.
