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THE NERVOUS SYSTEM, The Senses, Type of Sensory Receptors, Receives…
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The Senses
Tongue for testing
- The perception of taste
- The majority of the ten thousand or so taste buds possess are found on the papilla of the tongue
- Gustatory Epithelial Cells = Chemoreceptors
- Basal Epithelial Cells = Stem cells that replace Gustatory Epithelial Cells as they get damage or burnt
Touch is not localizes and different modalities
- pain
- temperature
- vibration
Ears for hearing
- The external and middle portions - transmit airbone sound waves to the fluid-filled inner ear, amplifying sound energy
- The inner ear houses sensory cochlea - contains receptors for conversion of sound wave into nerve impulses, making hearing possible
- The inner ear houses sensory vestibular apparatus - necessary for the sense of equilibrium
Eye for vision
- Light Transmission
- Cornea, anterior chamber, lens, vitreous chamber and retina
- Provide nutrients to the lens and cornea which have no blood vessels
- Vitreous chamber is filled with a transparent gel, the vitreous body
Nose for smelling
- Chemoreceptors
- The structure responsible for this called olfactory epithelium, up in the roof of nasal cavity
- The smell depends on the olfactory receptor cells detecting odors or scents
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- Receives information outside the bodies
- The interface between human being and surroundings
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- Consist of the brain and spinal cord
Perception - the ability to sense and perceive our surroundings
- The entry point for any stimulus somatosensory system, which is comprised of all the receptors along the exterior body
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Nearsighted Vision
- Longer eyeball
- Things focus in front of retina
- Difficult to see far thing
Farsighted vision
- Shorter eyeball
- Things focus behind retina
- Difficult to see close thing
5 Sense Taste Sensations
- Sweet
- Sour
- Salty
- Bitter
- Umami
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