How We Sense the World
Learning Objective
I can describe how the structures of the eye, ear, tongue, and skin enable sensory perception.
Key Concepts
Optical illusions exploit the disconnect between sensation and perception, or what your eyes see versus what your brain understands.
The eyeball wall consists of three layers: the fibrous, vascular, and inner layers.
The retina contains two types of photoreceptors called rods and cones, which convert light energy into electrical signals.
Practice Questions
This lesson includes 3 practice questions to reinforce learning.
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1. Describe the function of the iris and pupil in the eye. How do these structures work together to regulate the amount of light entering the eye?
2. Explain the roles of rods and cones in vision. How do their distributions in the retina contribute to our ability to see in different lighting conditions and perceive color?
3. Which of the following structures is responsible for converting light energy into electrical signals?
Educational Video
Vision: Crash Course Anatomy & Physiology #18
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