Receptors

ely3m17
Mind Map by , created over 5 years ago

A Levels Biology (Response to stimuli) Mind Map on Receptors, created by ely3m17 on 02/12/2014.

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ely3m17
Created by ely3m17 over 5 years ago
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Receptors
1 Photoreceptors
1.1 Cone cells
1.1.1 photopigment = iodopsin
1.1.1.1 erythrolabe = red
1.1.1.2 chlorolabe = green
1.1.1.3 cyanolabe = blue
1.1.1.4 depending on proportion stimulated = full spectrum
1.1.1.5 11 cis-retinal + opsin
1.1.2 concentrated at fovea
1.1.2.1 absent at peripheries
1.1.3 separate bipolar cell
1.1.3.1 cannot combine to reach threshold
1.1.3.1.1 low sensitivity
1.1.3.2 1 impulse for every cell stimulated above threshold
1.1.3.2.1 good visual acuity
1.1.4 fewer in no. than rods
1.2 Rod cells
1.2.1 more numerous than cones
1.2.2 cannot differentiate different wavelengths of light
1.2.2.1 images in black and white
1.2.3 pigment = rhodopsin
1.2.3.1 Retinal + opsin
1.2.4 periphery of retina
1.2.4.1 absent at fovea
1.2.5 retinal convergence
1.2.5.1 greater chance threshold is reached
1.2.5.1.1 sensitive to low intensity light
1.2.5.1.1.1 e.g. night
1.2.5.2 1 impulse generated for many rod cells
1.2.5.2.1 low visual acuity
1.3 light focused on macula
1.4 retina is inverted
2 Mechanoreceptors
2.1 Pacinian corpuscle
2.1.1 Distribution
2.1.1.1 fingers
2.1.1.2 soles of feet
2.1.1.3 external genitalia
2.1.1.4 Joints, ligaments, tendons (proprioception)
2.1.2 How it works
2.1.2.1 In resting state stretch-mediated Na+ channel too narrow
2.1.2.2 Neurone has resting potential
2.1.2.3 Pressure is applied (stimulus)
2.1.2.4 Membrane around neurone becomes stretched
2.1.2.5 Na+ channels widen in the membrane
2.1.2.6 NA+ ions diffuse into neurone
2.1.2.7 Influx causes depolarisation
2.1.2.7.1 Generator potential
2.1.2.7.1.1 Action potential
2.1.2.7.1.1.1 CNS
2.1.3 Stretch-mediated Na+ channel
2.1.3.1 Greater pressure = more channels open
2.1.3.1.1 = greater influx of Na+ ion

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