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What is the function of this pigment?

What is the function of this pigment?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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instead of opaque due to the parallel arrangement of its collagen fibers. b. The cornea is continuous with the sclera anteriorly but is translucent This avascular layer allows_ _to pass into the eyeball. 2. Layers of the Eyeball: The Vascular Layer is the middle layer that lies directly beneath the cornea and sclera. a. The choroid is the most extensive component, which contains capillaries and a pigment. What is the function of this pigment? b. The ciliary body, continuous with the choroid body anteriorly, contains a ring of smooth muscle that surrounds the lens. Suspensory ligaments connect the_ to the which allows for contraction and relaxation that changes the shape of the lens to focus light. c. The iris, the colored region of the anterior eye, is an extension of the vascular layer. The amount of the pigment determines iris color. d. The pupil is the opening found in the center of the iris through which enters the eyeball. 3. Layers of the Eyeball: The Neural Layer: the innermost layer of the eyeball is known as the retina, which is an incomplete layer found only deep to the choroid. The retina is composed of two layers and the following features a. Pigmented epithelium is a thin, superficial layer that reduces light scattering and nourishes the photoreceptors. b. Photoreceptor cells and the cells that form the optic nerve form the deep layer. Photoreceptor cells found in the retina detect and transduce light stimuli into electrical signals. The is a region of the retina in which a large number of photoreceptors are found allowing for detailed vision and the ability to focus on an object. 207 Copyright 2016 Pearson Education, Inc
Transcribed Image Text:instead of opaque due to the parallel arrangement of its collagen fibers. b. The cornea is continuous with the sclera anteriorly but is translucent This avascular layer allows_ _to pass into the eyeball. 2. Layers of the Eyeball: The Vascular Layer is the middle layer that lies directly beneath the cornea and sclera. a. The choroid is the most extensive component, which contains capillaries and a pigment. What is the function of this pigment? b. The ciliary body, continuous with the choroid body anteriorly, contains a ring of smooth muscle that surrounds the lens. Suspensory ligaments connect the_ to the which allows for contraction and relaxation that changes the shape of the lens to focus light. c. The iris, the colored region of the anterior eye, is an extension of the vascular layer. The amount of the pigment determines iris color. d. The pupil is the opening found in the center of the iris through which enters the eyeball. 3. Layers of the Eyeball: The Neural Layer: the innermost layer of the eyeball is known as the retina, which is an incomplete layer found only deep to the choroid. The retina is composed of two layers and the following features a. Pigmented epithelium is a thin, superficial layer that reduces light scattering and nourishes the photoreceptors. b. Photoreceptor cells and the cells that form the optic nerve form the deep layer. Photoreceptor cells found in the retina detect and transduce light stimuli into electrical signals. The is a region of the retina in which a large number of photoreceptors are found allowing for detailed vision and the ability to focus on an object. 207 Copyright 2016 Pearson Education, Inc
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