Sensory mechanisms Flashcards
What is stimulus?
Sensory input that causes some change within or outside the body
What is a receptor?
Structure that detects stimulus and converts its energy into another form
What are receptors that adapt?
-Light touch
-Pressure
-Smell
Are somatic sensations specific?
No, they are general. Arise from receptors located throughout the body
What do thermorecptors near the skins surface do?
Provides information about the external environment
What do thermorecptors in the thoracic and admoninal organs do?
Monitor core temperature
What does fast pain do?
Informs us of stimuli to be avoided
Where does slow pain orginate from?
In muscles or internal organs
Do pain receptors adapt?
No
Where are taste buds distributed?
Front, back and sides of the tongue
What happens during smell?
Chemortecptors bind with odorants
What does the outer ear do?
Chanels sound waves
What does the pinna do and where is it located?
Outer part of the ear
Directs sound waves to auditory canal
What does the auditory canal do?
Directs sound waves to the gympanic membrane
What is the tympanic membrane known as?
The ear drum
What does the middle ear do?
Amplifies sound
What are the 3 small bones in the middle ear
malleus, incus, and stapes
What does the inner ear do?
Sorts and converts sound
What does the cochlea do?
Converts sound to action potentials
What part of the ear plays a role in balance?
The inner ear
What do semicircular canals do?
Sense rotational movement
What does the iris do?
Regulates the amount of light coming in by changing the pupil size.
What is myopia?
Nearsightedness
Eye is longer then normal
What is hyperopia?
Farsightedness
Eyes are shorter than normal
What does the retina do?
Allows us to see in color, perceive images, and vary light intensities
Layers of the retina?
- Outermost
- Photorecptors
- Bipolar
- Innermost
True or false
Rods and cones are evenly distributed in the eye
False
There is more rods
