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Sense organs
Explain that sense organs consist of groups of receptor cells that react to specific types of stimuli such as light, sound, touch, temperature, and chemicals.
9
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90
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63
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90 min
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CambridgeIGCSEBiologyCoordination and response
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Sense organs outcomes9 objectives
- Explain that sense organs consist of groups of receptor cells that react to specific types of stimuli such as light, sound, touch, temperature, and chemicals.
- Recognize and label the components of the eye in diagrams and images, including the cornea, iris, pupil, lens, retina, optic nerve, and blind spot.
- Detail the role of each part of the eye, specifically: (a) cornea - bends light (b) iris - regulates light entry through the pupil (c) lens - focuses light onto the retina (d) retina - contains light-sensitive receptors, some of which detect different colors (e) optic nerve - transmits signals to the brain.
- Clarify the pupil reflex in relation to variations in light intensity and the resulting changes in pupil size.
- Discuss the pupil reflex by describing the opposing actions of the circular and radial muscles in the iris.
- Describe how accommodation occurs to focus on near and far objects, involving the contraction and relaxation of ciliary muscles, tension in the suspensory ligaments, lens shape, and light refraction.
- Illustrate the distribution of rod and cone cells within the human retina.
- Summarize the functions of rods and cones, noting: (a) rods are more sensitive for night vision (b) there are three types of cones that absorb different colors of light for color vision.
- Locate the fovea in diagrams and images and describe its purpose.
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