Biology - Chapter 8.5 - The Senses and Sense Organs
Terms in this set (25)
What are the three broad categories of sensory receptors in the skin?
Pain, mechanoreceptors, thermoreceptors
Hare are pain receptors stimulated?
Some become activated when extremes of heat or cold cause your skin temperature to rise or fall to dangerous levels. Other pain receptors are sensitive to excessive levels of mechanical stress, still others are sensitive to chemical changes caused by damage to your body's cells.
...What are your two chemical senses?
Taste and smell
What organ is responsible for your sense of balance?
The inner ear (specifically the semicircular canals).
Describe the parts of the ear and how we hear.
Answers will vary.
--cartilaginous, designed to collect and funnel sound toward the ear drum.
--a taut membrane stretched across the ear canal, vibrates when sound waves strike it.
Malleus, incus, and stapes
--small bones located in the middle ear, vibrate as sound waves pass through them and intensify the waves but preserve quality of sound as it approaches the inner ear.
--fluid-filled, coiled-tube chamber shaped like a snails shell; as vibrations enter the cochlea from the stapes, they create waves in the fluid that are picked up by nerves.
--three fluid-filled tubes of the inner ear, serve as balance sensors.
What is persistence of vision?
The continued perception of an image for about a tenth of a second after the object is gone.
Describe the parts of the eye and how we see.
Answers may vary.
--bone that protects the eye from damage
--blinks to keep eye clean and lubricated
--produce tears to clean, lubricate and disinfect the eye.
--move the eye
--tough white outer layer of the eye, provides protection
--area through which light centers the eye
--middle layer of the eye
--layer of connective tissue rich in blood vessels to provide the eye nourishment
--Involuntary muscles which adjust the lens to focus the light that enters the eye
--colored portion of the eye
--the hole through which light enters
--the innermost layer of the eye, contains all the rods and cones necessary for vision
--cells in the retina responsible for detecting light and dark
14. Cones*--cells in the retina responsible for detecting colors
--small area at the back of the eye that produces the clearest vision because of rod/cone density
--a bundle of nerves that relay the nerve impulses to the brain for processing
Why does a landscape look vividly colored in bright sunlight but appears only by shades of grey by moonlight?
The moonlit landscape is seen in shades of gray because it is dimly lit, and therefore is seen primarily by rod cells, which do not distinguish color.
During the day on the other hand, the same landscape would be viewed primarily with color-sensing cone cells, causing it to be seen in vivid color.
A group of neurons located in intricately which provide for sight, hearing, smell, taste and balance.
A bare dendrite that reacts to a certain type of strong stimuli.
Receptors that respond to temperature changes, heat and cold.
Receptors located on the tongue and nose which senses taste and smell.
Organs responsible for the sense of taste, which are chemoreceptors on the back, sides and front of the tongue, detecting dissolved chemicals in the mouth.
Thought to be seven primary odors which we can smell.
-oil of peppermint
-vinegar, some spices
Ringing in the ears...
Area through which light enters the eye
Colored portion of the eye
The hole through which light enters
Small area at the back of the eye that produces the clearest vision because of rod/cone density
Substance in rod cells that absorbs light.
Persistence of vision
About a tenth of second delay between the time that light from an object strikes the retina and the time that the brain receives the signal, which persists (remains) for the short time.
The increase in the curvature of the lens to focus on nearby objects.
A focusing problem usually a result of an asymmetrically curved cornea, which causes light rays entering the eye to be bent incorrectly.
A condition in which the pressure of the fluid inside the eye becomes much higher than normal, causing permanent damage to the cells of the retina.
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