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Bio 182
Sensory Systems
21
Biology
Undergraduate 1
04/23/2011

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Term
Sense Stimuli for:
1. Mechanical
2.Thermal
3. Electric
Definition
1. Touch
2. Temperature
3. Muscle Movement
Term
Sense Stimuli for:
1. Chemo
2. Photo
Definition
1. Chemo:
a. Smell
b. Taste
2. Sight
Term
What is the importance of separate receptors?
Definition
Able to distinguish between touch, cuts, burns, pain, pleasure etc.
Term
Pheromones
Definition
chemical signals to attract mates
Term
Where are the receptors for olfactory system located?
Definition
Top of the nasal cavity
Term
Odorant
Definition
molecule that stimulates olfactory receptor
Term
Mucus in olfactory
Definition
Protects nasal cavity. Mucus increases with a cold
Term
What kind of receptor is a taste bud?
Definition
chemoreceptor
Term
How many taste buds are on the human tongue?
Definition
10,000
Term
Where are taste buds located on fish and the platypus?
Definition
Fish: Skin
Platypus: Bill
Term
5 main categories of taste
Definition
1. Sweetness
2. Bitterness
3. Sourness
4. Saltiness
5. Umami (MSG)
Term
How does touch work?
Definition
With receptor cells
Merkel's Discs: Continuous
Meissner's Corpuscle: Non-hairy skin, fire rapidly. Allows you to distinguish between objects when held
Term
Ear Pinnae
Definition
Collects sound waves
Term
Eustachian tube
Definition
A canal extending from the middle ear to the pharynx
Term
Tympanic Membrane
Definition
Ear drum
Term
Components of the middle ear
Definition
air filled, opens to throat. regulates pressure. 3 bones.
Term
3 Bones present in the middle ear
Definition
1. Malleus: Hammer
2. Incus: Anvil
3. Stapes: Stirrup
Term
Cochlea
Definition
Inner ear
Term
Function of hair cells
Definition
flex basilar membrane to register different pitches
Term
Conduction deafness
Definition
loss of function of tympanic membrane and ossicles. caused by repeated infections of the middle ear / scarring. Age: ossicles stiffen
Term
Nerve Deafness
Definition
Damage to hair cells of inner ear. Caused by exposure to loud sounds. The damage is cumulative and irreversible.
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