Special Senses- olfactory

Question 1

Modality

Answer 1

Type of stimulus that receptor respond to - taste,smell

Question 2

Chemoreceptors

Answer 2

Chemical receptor- smell/taste

Question 3

Photoreceptors

Answer 3

Light intensity- vision

Question 4

Electroreceptor

Answer 4

Electrical fields

Question 5

Magnetoreceptor

Answer 5

Magnetic field

Question 6

Thermoreceptor

Answer 6

Temperature

Question 7

Mechanoreceptor

Answer 7

Pressure and movement- touch, hearing, balance, BP

Question 8

Modality

Answer 8

Based on type of stimuli/ receptor detected - modality=stimuli

Question 9

Labeled line- sensory receptors- modality of sensation (pathway)

Answer 9

Principal type of sensation- pain, touch, sound. Despite fact that we experience different modalities of sensation, nerve fibers transmit only impulse

Question 10

How do different nerve fibers transmit different modalities of sensation

Answer 10

Each nerve tract terminates at a specific point in CNS. Type of sensation depends on point in NS to which fiber leads

Question 11

Transduction

Answer 11

Convert stimulus (energy) to electrical impulse. Cannot maintain homeostasis without transduction

Question 12

Labeled line

Answer 12

Stimuli- specific electrical current-specific receptor- specific part of the brain

Question 13

Sensory receptor

Answer 13

Specialized cell or cell monitoring processes monitoring conditions in/out of body. Specific for receptor “ receptor specificity”

Are all transducers changing incoming stimulus into impulse

Question 14

Homeostasis

Answer 14

Not keeping conditions static , keeping conditions in tightly regulated physiological tolerance limits

Question 15

Components of a sensation

Answer 15

1. Stimulus- change in environment ( think receptor)
2. Transduction receptor carries this out. Converts to electrical energy
3. Conduction- carried out by sensory neuron
4. Translation- brain carries this out. Translate impulse to sensation- brain detects

Electrical energy travels

Question 16

Sultatory conduction- myelinated axon

Answer 16

Continuous conduction-unmyelinated axon

Question 17

Translation

Answer 17

Conversion of impulse to a registration of the stimulus in the brain. Result is a sensation

Question 18

Sensation

Answer 18

Generally subconscious level. Touch, taste, sight, sound, smell

Question 19

Perception

Answer 19

When sensation becomes conscious, sensation interpreted. How we make sense of things around us

Question 20

Reflex arc

Answer 20

Can’t react to stimulus not detected properly

Arc— (sensory portion) receptor- sensory neuron- cns (brain)- ( activates) motor neuron- effector (organ)

Question 21

Olfactory (smell)

Answer 21

-Sensitive.
-Depends on sensory receptors responding to airborne chemical
- cavity lined with epithelium, small patch of olfactory epithelium.
- modality- chemoreceptors- located in olfactory epithelium
-Sensory neurons- each with primary cilium
-

Question 22

Olfactory epithelium

Answer 22

Lots of bipolar neurons ( 2 extensions),

Chemicals we smell are water soluble

Transport is thru cranial nerve #1- olfactory nerve

Olfactory tract carries impulse to brain

Question 23

Olfactory pathway

Answer 23

Receptor- nerve tract- thalamus- temporal lobe- (olfactory center)

Question 24

Primary cell sensations

Answer 24

Camphoraceous ( sulfur)
Musky
Floral
Peppermint
Ethereal 
Pugnet (sweet)
Putrid ( decay)

100 primary sensations of smell