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What are the 3 classes of sensory receptors?
What do sensory receptors do?
use sensory information to generate a reflex
- detect stimuli from the outside
- ex: sense (touch, taste, smell, hearing, vision)
- detect stimuli from the inside
- ex: blood pressure
- specialized class of interoceptors
- ex: muscle memory
stimuli that distort plasma membranes
How do somatic sensations work?
stimulus > receptor > apharent > epharent > response
somatic sensation of pain:
conscious perception of a noxious stimuli
What body system does pain not occur in?
central nervous system
receptor for pain:
nocicpeter nerve ending
reaction threshold for pain:
highly variable among individuals
diversion of pain:
- decrease in pain perception
- ex: twitch
surface of skin
mucous membrane of nasal cavity that includes the olfactory nerve
heightened sense of smell detection
less sophisticated sense of smell detection
without sense of smell
- detects pheromones in the air
- sits on hard pallete in the mouth
- by-passes hypothalamus and goes straight to CNS
What are pheromones?
- detectable chemicals that cause changes in animal behavior
- scent glands, communication, reproduction
sense of taste
- taste cells
- cluster: taste buds
4 basic taste sensations:
importance of saliva:
- lubricates food as it goes down
- buffers stomach contents
- helps dilute chemicals so they can be individually detected
- specialized sense of hearing
- uses sound waves
How is sound recepted?
- sound wave enters external ear
- waves hit ear drum and causes vibrations
- motion travels from middle ear to vestibule
- vibration hits fluid-filled sack and goes to cochlear nerve
- nerve sends transmission to central nervous system
visual sensory receptors:
visual sensory stimulus:
- locates sound
- made of elastic cartilage
- detects sound
- hollow chamber filled with air
- has bones and muscles that help send vibrations
external layer of the eye:
middle layer of eye:
- ciliary body & muscles, lense, iris, choroid
internal layer of eye:
- retina (light processing)
translucent coating behind the retina
what does field of vision depend on:
how they eye is set on the skull
- aka sensory neurons
- receive information from the outside and sends them to other neurons so the body can produce a response
- aka motor neurons
- receive info from other neurons and sends that information to effectors (muscles, glands) which produce a reponse
perception of frontal cortex:
perception of hypothalmus and amygdala:
- emotional perception
perception of hippocampus:
What part of the ear contains fluid?
What bones are in the ear?
What part of the eye detects color?
black and white
What part of the eye lets light in?
What controls amount of light?
translucent coating behind the retina:
Which sense organs can be coupled together?
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