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Biology 30 Alberta: The Senses Questions and Answers 100% Pass
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Biology 30 Alberta: The Senses Questions and Answers 100% Pass
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Biology 30 Alberta: The Senses Questions and Answers100% Pass
What are photopsins? -Answer Pigments that use light to cause splitting reaction in cones
What is in cones? -Answer Photopsins
What are the three types of cones? -Answer Red, green, and blue
What is the pathway of light? -Answer Cornea, aqueous humour, pupil, lens, vitreous
humour, retina
What does the choroid layer do? -Answer Behind the retina; provides nourishment for the
cells of the retina and absorbs stray rays of light
What is the pathway of light to the photoreceptors? -Answer Retina (nerve fibres),
ganglion
cells, bipolar cells, rods & cones
What is the pathway of photoreception nerve impulses to the brain? -Answer Rods &
cones,
bipolar cells, ganglion cells, nerve fibres, optic nerve, thalamus, occipital lobe
What is the blind spot? -Answer The optic disc. Does not have any photoreceptors and
therefore cannot detect light. Each eye has its own blind spot, which the other eye
compensates
,for
How are images cast onto the retina initially? -Answer Upside down (brain interprets image
right side up)
What is binocular vision? -Answer Two forward-facing eyes with overlapping fields of view
allow for good depth perception
What is the optic chiasma? -Answer An X-shaped structure formed at the point below the
brain where the two optic nerves cross over each other
What does correct vision require? -Answer For light to be focused most sharply on the
fovea
of the retina
How are stimuli detected? -Answer By sensory receptors
How does sensation occur? -Answer Electrochemical impulses arrive at cerebral cortex
Sensory adaptation -Answer Process by which repeated, insignificant signals are filtered
out
What do photoreceptors do? -Answer Detect light (e.g. rods and cones in human eye)
What do chemoreceptors do? -Answer Detect chemical signals (e.g. olfactory cells for
smell,
, taste buds, internal detection of pH levels, etc.)
What do mechanoreceptors do? -Answer Detect varying forms of pressure (e.g. hair cells in
ear for sound waves, proprioceptors for muscle posture and orientation, etc.)
What do thermoreceptors do? -Answer Differentiate between hot from cold temperatures
What is the iris? -Answer Pigmented part of the eye that surrounds the pupil.
Constricts/dilates, changing size of pupil depending on amount of light
What is the lens of the eye? -Answer Located behind pupil, is biconvex, transparent, and
avascular. Ciliary muscles and suspensory ligaments change shape of lens to focus light on the
retina
What do rods detect? -Answer Light and motion (about 125 million in the retina)
What do cones detect? -Answer Colours (about 6 million in retina)
What accounts for 70% of the sensory receptors in the human body? -Answer Rods and
cones
What are rods for? -Answer Dim light and peripheral vision; concentration on edges of
retina
What do rods contain? -Answer A light-absorbing pigment called rhodopsin
What does rhodopsin do? -Answer Splits into retinal and opsin when light is present. This
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