An Easy Guide to Learning Anatomy and Physiology by Forciea Bruce

Author:Forciea, Bruce [Forciea, Bruce]
Language: eng
Format: epub
Tags: ebook, help, simple, anatomy and physiology, made easy, how to, textbook, anatomy, idiots, study guide, learning, learn, easy, made simple, physiology, dummies
Published: 2013-12-13T22:00:00+00:00

Vision

To take our food analogy a bit further we now come to the meat and potatoes section of the sensory system. This includes vision and hearing and we will spend a good deal of time here. Let’s begin with vision.

Vision is sensed by the eyes (of course). So we will spend some time getting the big picture of how the eye is put together.

The Big Picture: The Eye

The eye consists of three layer called tunics.

The eye is put together in three layers called tunics. There is an outer, inner and middle tunic in each eye. In order to understand how the eye is put together let’s look at an old fashioned camera.

Here we have a very basic camera (Fig. 10.1). There is a frame to hold things together, a lens, an aperture and a piece of film. Light rays from the subject pass through the aperture, lens and a space in the frame to reach the film. The aperture can change its diameter to let in more or less light. Notice that the image is upside down on the film.

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