BIOL 1F25 Study Guide - Final Guide: Peripheral Nervous System, Vasoconstriction, Posttraumatic Stress Disorder
15 Oct 2016
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Document Summary
What does the nervous system do: senses info from environment (brain ignores large % of info received = learned memory, imports info, analyses / stores info, generates behavioural responses. Two parts of nervous system: central nervous system (cns): brain and spinal cord, peripheral nervous system (pns): nerve fibres that transmit signals between the. Similarities to other cells: plasma membrane, cytoplasm, organelles (mitochondria, protein synthesizing machinery (rer, nucleus (genetic info, cell body, main body of a neuron, receives info from dendrites if enough stimulation, it is passed on to the axon. Unique to neurons: dendrites, extensions of cell body, receive info from other neurons and sensory receptors by chemicals (neurotransmitters, axon, long, slender tube of cell membrane containing a small amount of cytoplasm. Neurotransmitter release: presynaptic membrane of neuron is sending info, vesicles contain the message, postsynaptic membrane of cell is about to receive this info, synaptic cleft is the small fluid filled gap that separates the presynaptic and postsynaptic membranes.
