1. A sense organ is a group of sensory receptors that detect, transduce, and amplify stimuli so an animal can perceive its environment.
2. Chemical, light, mechanical
3. A chemical change provokes a nerve impulse.
4. Sensation = stimulus
Perception = awareness of stimulus
5. Definitions in text.
6. Brain evaluates pattern when odorant molecules bind receptors in the olfactory epithelium.
7. Answers will vary.
8. Follow Figure 32.8 and the explanation on pages 648 and 649.
9. Statocysts -- fluid-filled cavities with sensory hairs and bits of mineral called statoliths.
10. Taste cells have a three day turn over.
11. Answers will vary.
12. Blending of inputs.
13. Answers will vary.
14. Answers will vary.
TO THINK ABOUT
1. Answers will vary.
2. The presence of the receptors would be inherited.
3. Retinal (in rhodopsin) is a derivative of vitamin A.
4. Answers will vary.
5. Mixed signals required for motion sickness do not get through.
6. Combinations.
7. Answers will vary but should include something about the environment of the animal, including ever present needs and dangers.
8. Common origin. Other answers possible.
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