Action potential - A temporary reversal of the charges across the axon membrane which increase from -65mV to +40mV, depolarising the membrane, All-or-nothing principle - An action potential is exactly the same size, regardless of the size of the stimulus, providing it reaches the threshold value., Depolarised - Condition used to describe the part of the axon membrane when the potential across the membrane has a positive charge of around +40mV (it is a temporary reversal of charges across the membrane)., Generator potential - Depolarisation of the membrane of a receptor following a stimulus and then transduction (or conversion) of one form of energy into electrical energy, Nerve impulse - A self-propagating wave of electrical disturbance that travels along the surface of an axon membrane, Neurone - Specialised cells adapted to rapidly carrying electrochemical changes called nerve impulses from one part of the body to another eg sensory, motor and intermediate, Pacinian corpuscle - A sensory receptor which responds to change in mechanical pressure, Polarised - Condition used to describe the axon membrane when the inside of an axon is more negatively charged relative to the outside (at the resting potential: usually around -65mV)., Receptor - A cell or part of a sensory neurone which is adapted to detects a stimulus, Response - The result of a stimulus on an organism, Sensory neurones - Neurones which carry nerve impulses from receptors towards the CNS, Stretch-mediated sodium channels - A special type of sodium channel which is found at the sensory neurone ending at the centre of the Pacinian corpuscle. Their permeability to sodium changes when they are deformed by stretching., Threshold value - The minimum level of stimulus needed to trigger an action potential in a neurone, Transducer cells - Cells that convert physical or chemical stimuli into electrical or chemical signals,

Receptors

Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?