KIN 155 Study Guide - Midterm Guide: Resting Potential, Sodium Channel, Stimulus Modality
22 Oct 2016
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Document Summary
Neurons are the communicators of the nervous system. There are 100 billion neurons within nervous system with 100 000 billion synapses. Glial cells are non-neuronal cells that maintain homeostasis, form myelin and provide support/structure for neurons. Cell body - central database which contains the nucleus and other membrane bound organelles. Axon hillock bridge between axon and cell body. Axon terminal presynaptic endings which synapses to a postsynaptic membrane. Neuron to neuron communication it is a form of electrochemical communication resting membrane potential: inside of the cell is negative compared to the outside. Action potential: rapid depolarization and repolarization of the membrane potential. All or none response: if the stimulus reaches threshold, it will fire in an all or none fashion. Determined by ion concentration (and charge) inside and outside of the cell membrane. Organic anions and potassium have a bigger concentration in the inside as compared to the outside.
