Sensory Systems

Sensory Systems - Sensory Systems Chemoreceptor Sensory...

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    Sensory Systems
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    Chemoreceptor Sensory Systems The olfactory system and the gustatory system detect chemicals and are therefore chemoreceptor systems The chemicals must be dissolved within a bodily fluid: Olfactory system: odor molecules must dissolve within the fluid (mucus) of the nasal cavity Gustatory system: taste molecules must dissolve within the saliva of the mouth
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    Olfactory Sense Sensory Receptors for smell are located within the olfactory epithelium Olfactory epithelium is located on the superior nasal concha
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    Sense of Smell Figure 15.3
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    Gustatory Sense Taste buds are located within papillae of the tongue Three types of Papillae: filiform fungiform circumvallate Fungiform and circumvallate papillae contain taste buds
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    Taste Buds Figure 15.1
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    Taste Sensations There are 5 or 6 taste sensations: Salt: detects metal ions Sweet: detects sugars, saccharin, alcohol, and some amino acids Sour: detects hydrogen ions Bitter: detects alkaloids such as quinine and nicotine Umami: obtained by the amino acid glutamate; gives the taste sensation of meat Water
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    Transmission of Sensory Information to  the Brain Cranial Nerves VII (Facial) and IX (glossopharyngeal) transmit the sensory information to the brain First to the medulla Thalamus Appropriate sensory cortex
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    Visual Sense Visual Receptors are located within the eye in a structure called the retina
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Sensory Systems - Sensory Systems Chemoreceptor Sensory...

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