PSYC1002 Study Guide - Final Guide: Dura Mater, Pia Mater, Peripheral Nervous System

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Central nervous system (cns): brain & spinal cord. 3 membranes- dura mater, arachnoid membrane, pia mater blood brain barrier these blood vessels supplying blood to cns have special walls, restricts entry of many chemicals. * heroin more potent than morphine as heroin readily crosses this barrier. Loss of oxygen to brain in 10s = loss of consciousness, irreversible brain damage in minutes. Requires 15% total blood flow, 25% oxygen consumption. Cable of neural fibres with "roots" branching off. Controls many non-voluntary bodily functions (e. g. digestion, heart rate, blood pressure, sweating) 2 branches: sympathetic (prepares for action), parasympathetic (rest/recuperation) Controls digestive activity (peristalsis, secretion of enzymes) & senses physical/chemical conditions of gut. Depolarization only occur at gaps between myelin sheath. Some neurons have no myelin (e. g. 2 types of pain fibers) Nts diffuse across synapse & bind to receptors on 2nd neuron. This causes change in 2nd neuron --> receptors open ion channel.

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