The document discusses the five main categories of sensory receptors in organisms: chemoreceptors, photoreceptors, nociceptors, electromagnetic receptors, and thermoreceptors. It focuses on the sensory receptors for taste, smell, sight, hearing, balance, touch, and temperature regulation in humans and other animals. Sensory receptors detect stimuli, convert the stimuli to nerve impulses, and send those impulses to the central nervous system for processing.

1. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 27 Sense Organs

2. Sensory Receptors Respond to Stimuli 27-

4. Figure 27.1A Electromagnetic receptors in gray whales help them migrate 27-

5. Figure 27.1B Thermoreceptors that are sensitive to infrared energy help pythons find their prey 27-

6. Figure 27.1C The ears of some bats use echolocation to find their prey 27-

8. Figure 27.2 Nerve impulses from sensory receptors result in sensation and perception in the brain 27-

9. Chemoreceptors Are Sensitive to Chemicals 27-

11. Figure 27.3 A male moth responds to a species-specific sex attractant 27-

13. Figure 27.4 Taste buds in humans 27-

15. Figure 27.5 Olfactory cells in humans 27-

16. Photoreceptors Are Sensitive to Light 27-

18. Figure 27.6 Anatomy of the human eye 27-

21. Figure 27.8A Focusing on a distant object 27-

22. Figure 27.8B Focusing on a near object 27-

24. Figure 27.9 Common abnormalities of the eye with possible corrective lenses 27-

26. Mechanoreceptors Are Involved in Hearing and Balance 27-

28. Figure 27.11 Anatomy of the human ear 27-

30. Figure 27.12 Mechanoreceptors for hearing 27-

32. Figure 27.13A Normal hair cells in the organ of Corti 27-

33. Figure 27.13B Damaged hair cells in the organ of Corti 27-

35. Figure 27.14A The receptors for rotational balance are in the ampullae of the semicircular canals 27-

36. Figure 27.14B The receptors for gravitational balance are in the utricle and saccule of the vestibule 27-

39. Figure 27.16A Lateral line system in fishes 27-

40. Figure 27.16B A statocyst of a lobster 27-