B: Sensory Organs
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Where are photoreceptors primarily found
In the Eyes
What are the 2 types of photoreceptors
Rods and cones
What is the difference between rods and cones
Rods detect intensity, cones detect colour
What receptors do ears use
Mechanoreceptord
What is mechanotransduction
The process of transferring pressure to sound
What are hair cells
Special mechanoreceptors in the ears that perform mechanotransduction
What kinds of pressure changes do hair cells detect
Sound and head movement
What are the different kinds of hair cells and what do they do
Cochlear—> sound and vestibular —> head orientation
The info obtained from the ear is transferred to the brain through the…
Auditory nerve
The info obtained from the eyes is transferred to the brain through the…
Optical nerve
The info obtained from the nose is transferred to the brain through the…
Olfactory nerve
How does the nose detect odours
The chemicals dissolve into the mucus in the nose and interact with the cilia of the chemoreceptors
What is the muscle that causes your pupils to dilate
Iris dilator muscle
What is the function of the cornea
It is a protective shield for debris, germs and UV light. It also refracts light into the pupil
What is the pupil
It is a black opening that regulates the amount of light that goes into the lens to diminish glare and enhance vision
What is the function of the lens
It refracts light onto the retina
What is the retina and what is its function
It contains rods and cones that convert light into electrical impulses
What is the function of the choroid layer
It protects the retina and provides nutrients to photoreceptors, and controls eye temperature, pressure and absorbs stray light