ry17 Senses ye: Mode desk lamp) 10% NaC1 Twning fork for two spoons) Hot plato S
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ry17 Senses ye: Mode desk lamp) 10% NaC1 Twning fork for two spoons) Hot plato Sharp meedle or pin Learning Objectives Students should be able to . identiy the parts of the eye, ear, and skin mentioned and state a function for each part 2. describe the experiments that make up this laboratory session and explain their significance Each type of sense organ is sensitive to a particular type of environmental stimeli. Sense organs are called receptors because they receive stimuli and thereafter generate nerve impulses. Eventually these nerve impulses reach the btain, where the phenomenon sensation oocurs. The brain interprets the world around us and is dependent on the sensc organs for the proper inpat. Because the sense organs are limited in their ability to respond to the environment, we sometimes can be fooled Eye With the help of figure 17.1, identify the following structures when examining an eye model. With the help of table 17., give a function for each structure in the space provided. Sclera Cornea Choroid Retina "See the laboratory resource guideExplanation / Answer
Sclera: The sclera is commonly referred to as the "whites" of the eye. This is a smooth, white layer on the outside, but the inside is brown and contains grooves that help the tendons of the eye attach properly. The sclera provides structure and safety for the inner workings of the eye but is also flexible so that the eye can move to seek out objects as necessary.
Cornea: The cornea is the outer covering of the eye. This dome-shaped layer protects your eye from elements that could cause damage to the inner parts of the eye. There are several layers of the cornea, creating a tough layer that provides additional protection. These layers regenerate very quickly, helping the eye to eliminate damage more easily. The cornea also allows the eye to properly focus on light more effectively.
Choroid: The choroid lies between the retina and the sclera, which provides the blood supply to the eye. Just like any other portion of the body, the blood supply gives nutrition to the various parts of the eye.
Retina: The light focuses by the lens will be transmitted onto the retina. This is made of rods and cones arranged in layers, which will transmit light into chemicals and electrical pulses. The retina is located in the back of the eye and is connected to the optic nerves that will transmit the images the eye sees to the brain so they can be interpreted.
Fovea centralis: The back of the retina, known as the macula, will help interpret the details of the object the eye is working to interpret. The center of the macula, known as the fovea will increase the detail of these images to a perceivable point.
Lens: The lens sits directly behind the pupil. This is a clear layer that focuses the light the pupil takes in. It is held in place by the ciliary muscles, which allow the lens to change shape depending on the amount of light that hits it so it can be properly focused.
Ciliary Body: the Ciliary body is a ring-shaped tissue which holds and controls the movement of the eye lens, and thus, it helps to control the shape of the lens.
Iris: The iris is the area of the eye that contains the pigment which gives the eye its color. This area surrounds the pupil and uses the dilator pupillae muscles to widen or close the pupil. This allows the eye to take in more or less light depending on how bright it is around you. If it is too bright, the iris will shrink the pupil so that the eye can focus more effectively.
Pupil: The pupil appears as a black dot in the middle of the eye. This black area is actually a hole that takes in light so the eye can focus on the objects in front of it.
Optic nerve: Carries impulses from eye to brain.
Blind spot: Region of no rods and cones on the retina.
2. cornea refracts the light and lens focus the light.
3. Retina contains receptors for sight.
4. RODS AND CONES ARE THE RECEPTORS FOR LIGHT.
5. OPTIC NERVE.
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