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M088. _×
what are the Muscular tissues of the eye? what are their origin, insertion, action, and innervation?.
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- Why does the blind spot from the optic disc in either eye not result in a blind spot in the visual field?Answer one 45-46. A) Trace the flow of information through the nervous system from stimulus to response. Be sure to identify the types of neurons involved. -OR- B) Describe what is meant by sensory adaption, and explain how this can be considered an evolutionary adaptation. -OR- C) Describe what is meant by afterimage, and explain how this supports the trichromatic theory of color vision.Image after (at the back) Retina Short distance Object Object https://ophysics.com/16.html Retina Human Eye Lens The above picture shows the defect of a human eye, where the image of the long distance object is formed before(in- front) the retina: 1) What type of eye defect is shown in the picture? 2) The reason for above eye defect is and 3) How can we correct the above eye defect?
- 3- 6- (a) Microscopic structuro of rotina 11 Chorold Sckera 450x (b) Pholomicrograph of retina vpuoa jo kupuanu 'oy pags aunoThe human retina has three types of receptor cones, eachsensitive to a different range of wavelengths of visible light,as shown in this figure (the colors are merely to differentiatethe three curves from one another; they do not indicate theactual colors represented by each curve):(a) Estimate the energies of photons with wavelengths at themaximum for each type of cone. (b) The color of the sky is dueto scattering of solar light by the molecules of the atmosphere.Lord Rayleigh was one of the first to study scattering of thiskind. He showed that the amount of scattering for very smallparticles such as molecules is inversely proportional to thefourth power of the wavelength. Estimate the ratio of the scatteringefficiency of light at the wavelength of the maximumfor the “blue” cones, as compared with that for the “green”cones. (c) Explain why the sky appears blue even though allwavelengths of solar light are scattered by the atmosphereQ11 (a.) Explain using a ray diagram how a normal eye focuses the image of an object on the retina. (b.) A doctor notices that one of her patients can see clearly some text when it is near but will see the same text appearing blurred when moved further away. Explain how such a defect can be corrected using a named lens (c.) Select a non-ionising imaging technique and explain how it is used in medical diagnosis
- D Acts as a reflexively activated diaphragm to vary pupil size. The only tissue in the body that can be transplanted from one person to another with little or no rejection. Controls lens shape. Viscous liquid that holds the retina firmly against the pigmented layer. Fluid blockages cause glaucoma. [Choose ] [Choose ] [Choose] [Choose] [Choose]Recall that the eye is composed of three layers or "tunics" — the fibrous, vascular, and nervous layers — which enclose two cavities that are separated from each other by the lens. Review the components of these three layers by matching each description with the appropriate letter in the figure below: 1. Fluid in the anterior portion of the eye that provides nutrients to the lens and cornea 2. The "whites" of the eye 3. Area of the retina that lacks photoreceptors 4. Contains smooth muscle that controls the shape of the lens 5. Nutritive (nourishing) layer of the eye 6. Layer containing rods and cones 7. Gel-like substance that helps support the eyeball 8. Pigmented smooth muscles that control pupil size 9. Most anterior component of the fibrous layer — your "window to the world" 10. Structure that changes shape to bend light toward rods and conesWhy is it easier to see images at night using peripheral, rather than the central, vision? Cones are denser in the periphery of the retina Bipolar cells are denser in the periphery of the retina Rods are denser in the periphery of the retina The optic nerve exits at the periphery of the retina.
- Which of the following events does not occur during light absorption in the vertebrate eye? The retinal component of rhodopsin changes from cis to trans form. Rhodopsin, a G-proteincoupled receptor, triggers a signaltransduction pathway to close Na+ channels in the plasmamembrane. The light stimulus passes from rods and cones to bipolar cellsand horizontal cells and then to ganglion cells, whose axonscompose the optic nerve. As light absorption increases, the rhodopsin response causesan increase in the release of neurotransmitters. When integrating information across the retina, horizontalcells connect the rods and cones, and amacrine cells join with the bipolar cells and ganglion cells.8 +++ ➤ In the following table (Table 1), briefly describe the location and a function of each type of muscle tissue, with respect to the digestive system, and to the respiratory system: Table 1. The Role of Muscle Tissue in the Digestive and Respiratory Systems Muscle Location in our body tissue type skeletal cardiac smooth Focus Mode Function of that muscle tissue type with respect to the digestive system the respiratory systemWhich of the following best describes the function of a camera type eye? A) To form high-definition images that are transmitted to the brain. B) To gather and concentrate light through a lens onto retinal tissue which generates an impulse that is transmitted to the brain. C) To protect the optic nerve which generates an impulse that is transmitted to the brain. D) To detect vibrations through the vitreous body which generates an impulse that is transmitted to the brain.