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Science Form2 : WorldThroughOur Senses
1.1 Sensory Organs and Their Functions
1.2 Sense of Touch
1. Skinis the sensoryorganthat can detecttouch,pain,pressure,heatandcold
2. Consistsof 3 mainlayer:
a) epidermis –outerlayer
b) dermis – innerlayer
c) fatty layer- insulator
3. Structure of humanskin
4. Functionof differentreceptors:
a) painreceptors - detectpain
b) touchreceptors - detectlighttouches
c) heat receptors - detectheat
d) coldreceptors- detectcold
e) pressure receptors - detectpressure
1.3 Sense of Smell
1. Nose isthe sensoryorganforsmell thatcan detectchemicalsinthe air.
2. Smell receptorslocatedatthe top of nasal cavity.
3. The nasal cavitylinedwithmucous thatisimportantto dissolve chemicals
4. Structure of humannose.
5. Detectionof smells
=> Chemicalsinthe airenterthe nasal cavity,dissolvedininthe mucustostimulate smell
receptors.
=> Smell receptordproduce impulseandsendthe messagestothe brain.
=> Brain interpretsthe messages
=> Smell identified
1.4 Sense of Taste
1. The tongue issensoryorganrelatedtothe sense of taste
2. 4 basicstaste:sweet,salty,sourandbitter
3. The surface of tongue coveredwith taste buds.
4. Each taste bud containsmanytaste receptors.
5. Salivadissolve chemicalstobe detectbytaste receptors
6. Sense of taste is helpedbysense of smell
1.5 Sense of Hearing
1. Ears are the sensoryorgansof hearingthat can detectsound.
2. Human ears has3 mainparts:
a) Outerear; pinna,earcanal,eardrum
b) Middle ear;ossicles(hammer,anvil &stirrup),oval window andEustachiantube.
c) Innerear; cochlea,auditorynerve andsemicircularcanals.
1.6 Sense of Sight
1. Sensoryorgansfor sightare the eyes,whichsensitive tolight.
2. The wall of the eyeball ismade upof 3 layers:
a) Sclera– tough,outerlayer
b) Choroid – black,middle layer
c) Retina– sensitive tolight,innermostlayer
Science form 2
Science form 2

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Science form 2

  • 1. Science Form2 : WorldThroughOur Senses 1.1 Sensory Organs and Their Functions 1.2 Sense of Touch 1. Skinis the sensoryorganthat can detecttouch,pain,pressure,heatandcold 2. Consistsof 3 mainlayer: a) epidermis –outerlayer b) dermis – innerlayer c) fatty layer- insulator 3. Structure of humanskin
  • 2. 4. Functionof differentreceptors: a) painreceptors - detectpain b) touchreceptors - detectlighttouches c) heat receptors - detectheat d) coldreceptors- detectcold e) pressure receptors - detectpressure 1.3 Sense of Smell 1. Nose isthe sensoryorganforsmell thatcan detectchemicalsinthe air. 2. Smell receptorslocatedatthe top of nasal cavity. 3. The nasal cavitylinedwithmucous thatisimportantto dissolve chemicals 4. Structure of humannose.
  • 3. 5. Detectionof smells => Chemicalsinthe airenterthe nasal cavity,dissolvedininthe mucustostimulate smell receptors. => Smell receptordproduce impulseandsendthe messagestothe brain. => Brain interpretsthe messages => Smell identified 1.4 Sense of Taste 1. The tongue issensoryorganrelatedtothe sense of taste 2. 4 basicstaste:sweet,salty,sourandbitter 3. The surface of tongue coveredwith taste buds. 4. Each taste bud containsmanytaste receptors. 5. Salivadissolve chemicalstobe detectbytaste receptors 6. Sense of taste is helpedbysense of smell
  • 4. 1.5 Sense of Hearing 1. Ears are the sensoryorgansof hearingthat can detectsound. 2. Human ears has3 mainparts: a) Outerear; pinna,earcanal,eardrum b) Middle ear;ossicles(hammer,anvil &stirrup),oval window andEustachiantube. c) Innerear; cochlea,auditorynerve andsemicircularcanals.
  • 5. 1.6 Sense of Sight 1. Sensoryorgansfor sightare the eyes,whichsensitive tolight. 2. The wall of the eyeball ismade upof 3 layers: a) Sclera– tough,outerlayer b) Choroid – black,middle layer c) Retina– sensitive tolight,innermostlayer