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- 4. Describe the roles of the retina and the optic nerve in vision.The eyes of vertebrates and cephalopods are similar in structure and function. A difference between the vertebrate eye and the cephalopod eye is that the vertebrate eye has: a. an iris surrounding the pupil, whereas in cephalopods the pupil surrounds the iris. b. a lens that changes shape when focusing, whereas in cephalopods the lens moves back and forth to focus. c. a retina that moves in the socket when recording the image, whereas in cephalopods the retina changes shape when stimulated. d. a pupil that shrinks in size in bright light, whereas cephalopods have a pupil that enlarges in bright light. e. retinal synthesized from vitamin A, whereas cephalopods lack retinal.What vibration-detecting systems are found in octopuses and insects?
- 1. Describe the role of the lens in vision.1) Compared to the lenses of amniote eyes, the lenses of teleost eyes _____." A) are more flexible and undergo more of a shape change to enable the fish to focus light rays in water B) rounder to bend light more C) flatter to avoid bending the light too much D) flatter to bend light more2. How does the eye perceive size, depth and relative distances?3. With the aid of a diagram, illustrate how the visual angle is calculated.
- 2. Discuss how we are able to smell5. My cat Mia has poor color vision, but can see very well in dark environments. What characteristic of her retina could best explain this? a. It mostly has ON bipolar cells b. It mostly has OFF bipolar cells c. It has many more rods than cones, particularly around the fovea d. It has many more cones than rods, particularly around the fovea e. It has very few photoreceptors and many more retinal ganglion cells2. List the parts of the ear and the eye, and briefly describe the function of each structure.
- 1) When the ciliary muscle in the amniote eye contracts its diameter ______ and the tension of the zonular fibers connecting it to the lens is released. This causes the lens to ______. A) increases, be stretched to a more flattened state" B) increases, be squeezed to a more rounded shape" C) decreases , be stretched to a more flattened shape" D) decreases, rebound to a more rounded shape"5. How does the eye normally adjust to looking at objects at different distances..?6. In reference to the sense organs "in the human body" what is a modality?
