What do somatic receptors respond to?
- Touch/pressure
- Posture/movement
- Temperature
- Pain
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| Term | Definition |
|---|---|
| What do somatic receptors respond to? | - Touch/pressure - Posture/movement - Temperature - Pain |
| Sensory receptors are specialized to generate graded potentials called what? | Receptor potentials |
| What is an example of Meissner's corpuscle working? | - sitting on a chair - shirt on body rapidly adapting receptor |
| What is an example of Merkel's corpuscle working? | - keeping your arms up slowly adapting receptor |
| Lateral inhibition | enhances localization of stimulus |
| The eyes are composed of what 2 components? | - optical: focuses visual image on receptor cells - neural: transforms visual image into graded AP's |
| What do the muscles in the eye look like when in focus? | - relaxed ciliary muscles, tension on zonular fibers, flattened lens - light rays of distant objects are parallel |
| What do the muscles in the eye look like when out of focus? | - relaxed ciliary muscles - light rays from near objects converge |
| What do the muscles in the eye look like when back in focus after being out of focus? | - firing parasympathetic nerves, contracted ciliary muscles, slackened zonular fibers, round lens |
| Presbyopia | loss of elasticity of lens = no near vision |
| Myopia/Hyperopia | eye too long or too short, respectively - due to lens focusing power |
| Astigmatism | lens surface is not spherical |
| Glaucoma | damage to retina from ocular pressure (aq/vit humor buildup) |
| Cataracts | clouding of lens |
| T/F: photoreceptor and bipolar cells undergo graded responses bc they dont have voltage-gated channels | True |
| What are the key differences between the ON and OFF neural pathways | 1. Bipolar cells of ON depolarize without any input, Bipolar cells of OFF hyperpolarize without any input 2. Glutamate receptors of ON bipolar cells are inhibitory, Glutamate receptors of OFF bipolar cells are excitatory |
| Neural pathway of hearing | - cochlear nerve fibers synapse with interneurons in brainstem - brainstem -> thalamus -> auditory cortex (in temporal lobe) |