Special Senses And The Eye Flashcards
Sensory receptor
- specialized ending on a neuron
* reacts to a specific stimulus
Stimulus
•a change in the internal or external environment of the body
Stimulus activation
- stimulus is picked up by a sensory receptor
* action potential is produced
Stimulus strength
- intensity of stimulus
* concentration and pressure
Stimulus awareness
•the body senses stimulus and acts accordingly
Stimulus adaptation
- over time a decreased stimulus
* ex: glasses on head
Cutaneous receptors are found
- in the skin
* others mostly found in inner organs or skeletal muscles
Cutaneous sensations include
•detected are:
-touch, pressure,vibration, heat, cold, pain, tickle, itch, proprioception
Pain and temperature receptors are located in
•free nerve endings
Branched endings with no specialized structure
List 5 tactile receptors
- Merkel’s disc
- hair follicle receptor
- Meissner’s corpuscles
- Ruffinis end organ
- Pacinian corpuscles
Merkel’s disk
•detects light touch and pressure
Hair follicle receptor
•senses light touch to the hair
Meissner’s corpuscles
•detects pressure and low frequency vibrations
Ruffini’s end organ
•senses continuous pressure and touch
Pacinian corpuscles
•detects deep pressure and high frequency vibrations
Taste receptors are also called
•Gustatory receptors
Location of taste receptors
•taste buds found in tongue and back if the throat
Gustatory receptor structure
- taste buds are a groups of taste and support cells
* contain pore and sensory hair receptors
Gustatory receptor activation
- chemical reaction in which food and saliva mix and enter the pores
- activating the hair receptors
Gustatory sensations
- bitter
- sour
- salty
- sweet
Gustatory sensation: bitter
•back of tongue
Gustatory sensation: sour
•middle and sides of tongue