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UNIT FOUR: Sensation and Perception

door Sydney Peats

fruit

door Tikhonkova Yana

1.1.THE SENSE ORGANS

door Moira MS

The five senses

door Annamaria De Pasquale

RECEPTORS

Touch

In skin

Taste

Tongue

Taste buds

Two parts

Nerve endngs

Take the nerve impulses of itstaste receptor

Taste receptors

Transform the stimuli into nerve impulses

detect substances disolved in the saliva/liquids

Have chemo receptors

Tiny bumps that cover the surface of the tongue

Let humans detect certain substances dissolved in liquids found in the oral cavity

Smell

Olfactory nerve

Transport tthe nerve impulse to the brain

Olfactory bulb

send the nerve impulse to the olfactory nerve

collect the nerve impulse

Olfactory mucosa

transform chemical stimuli into nerve impulses

have chemoreceptors

Let humans detect particles dissolved in the air

Hearing

Inner ear

auditory nerve

transmit the nerve impulse to the brain

Cochlea

Its fluid recieve vibrations from the stapes, that makes that the cilia(the hair of the cells) vibrate sp the cells change that stimuli into nerve impulse

vestibular system

iIt occupies of the balance of the body

Middle ear

Eustachian tube

Comunicates the inner ear with the nasal cavity

Ear bones

Vibrations pass throught them

Malleus,incus and stapes

Ear drum

vibrates with the sound

Outer ear

ear canal

Connect pinna with eardrum

Pinna

intercept sound waves

Is the sense that humans use to detect sound

Sight

Parts:

Optical nerve

Transport Nerve impulse to the brain

Retina

Have:

rodes:provide a detailed vision

Cones:Detect the amount of light

Acts as a mirror

Pupil

when light is low:it expands

When light is bright:it contracts

Iris:

Expand and contract pupil

Cornea

transparent

Protect Iris and pupil