bio sf 3 - Humans perceive: Salty Sweet Sour Bitter Umami...

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Senses!
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How do sensory cells convert stimuli? Sensory receptor cells (or receptors) transduce physical and chemical stimuli from the environment Signals sent to the nervous system for processing and interpretation
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Receptor proteins can open or close ion channels in the sensory cell This can cause a change in the electrical potential across a membrane This change leads either to an action potential or to release of neurotransmitter
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How Perceptions Are Formed Sensory systems – the sensory cells, associated structures, and the neural networks that process the information Process information in form of action potentials Sensations differ because the message from different kinds of sensory cells arrive at different places in the CNS
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Special Senses: Taste Also called gustation Depends on clusters of chemoreceptors called taste buds
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Unformatted text preview: Humans perceive: Salty Sweet Sour Bitter Umami Special Senses: Olfaction Dependent on chemoreceptors olfactory receptors Olfactory receptors are neurons embedded in nasal epithelium specific to odorants Special Senses: Vision Rods photoreceptors in the retina that distinguish between light and dark Cones photoreceptors in the retina that enable us to see color Blind spot determination where the optic nerve enters the retina no rods or cones Your eyes and brains compensate for this blind spot Sensation in the Skin Nociceptors detect pain Exteroceptors detect light or deep touch Thermoreceptors detect temperature Proprioreceptors detect stretch/movement General sensation in the skin organized as a dermatome...
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bio sf 3 - Humans perceive: Salty Sweet Sour Bitter Umami...

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