Indicate whether the statement is true or false.
1. The image on the retina is upside down and backward due to bending of light rays.
a. True
b.
... [Show More] False
2. Pain may be elicited by thermal or chemical stimuli.
a. True
b. False
3. Most innervated blood vessels receive only sympathetic nerve fibres.
a. True
b. False
4. The term cataract refers to the condition in which the lens becomes stiff and loses its elasticity.
a. True
b. False
5. The terminals of both autonomic nerve fibres and motor neurons end in a single, enlarged knoblike structure that releases neurotransmitter.
a. True
b. False
6. Unmyelinated C fibres send impulses for slow pain pathways.
a. True
b. False
7. Light rays passing through a concave lens undergo convergence.
a. True
b. False
8. Exposure to very loud noises can result in partial conductive deafness.
a. True
b. False
9. When an individual sees pure red, only the red cones are stimulated.
a. True
b. False
10. The circular muscle of the iris contracts in response to dim light.
a. True
b. False
11. Cones are more abundant than rods throughout the entire retina.
a. True
b. False
12. A convex lens converges light rays or brings them closer together.
a. True
b. False
13. Descending analgesic pathways are believed to suppress transmission in the pain pathways as they enter the spinal cord by blocking the release of substance P.
a. True
b. False
14. Short-wave lengths of light within the visible spectrum are sensed as violet or blue.
a. True
b. False
15. ACh is the neurotransmitter released to signal skeletal muscles.
a. True
b. False
16. Any stimulus can excite any excitable tissue.
a. True
b. False
17. Muscarinic receptors are found on the effector cells innervated by the sympathetic division.
a. True
b. False
18. The sclera is the most internal layer of the eye.
a. True
b. False
19. The olfactory mucosa contains enzymes that remove odoriferous molecules so that the sensation of smell doesn’t linger after the source of the odour is removed.
a. True
b. False
20. Contraction of the radial muscle of the iris produces a dilation of the iris.
a. True
b. False
21. The cortical gustatory area is located adjacent to the “tongue” region of the somatosensory cortex.
a. True
b. False
22. The curvature of the lens must be adjusted to enable the eye to focus both near and far sources on the retina.
a. True
b. False
23. Accommodation permits near vision.
a. True
b. False
24. Sympathetic postganglionic fibres are longer than parasympathetic postganglionic fibres.
a. True
b. False
25. In response to high-frequency sounds, the segment of the basilar membrane closer to the oval window vibrates maximally.
a. True
b. False
26. Night blindness is due to a deficiency of vitamin C.
a. True
b. False
27. The sympathetic nervous system is always excitatory to the organs it innervates.
a. True
b. False
28. Diplopia is another name for double vision.
a. True
b. False
29. Action potentials are initiated at the motor end-plate region of skeletal muscle fibres.
a. True
b. False
30. Rods produce vision in shades of grey.
a. True
b. False
31. In hyperopia the far source is focused on the retina with accommodation, and the near source is focused behind the retina.
a. True
b. False
32. The sympathetic postganglionic fibres that innervate the sweat glands secrete acetylcholine rather than norepinephrine.
a. True
b. False
33. The utricle detects changes in head position away from horizontally and vertically directed linear acceleration and deceleration.
a. True
b. False
34. Sympathetic stimulation of the gallbladder relaxes the activity of this organ.
a. True
b. False
35. Most innervated blood vessels receive sympathetic and parasympathetic fibres.
a. True
b. False
36. Autonomic activity can be influenced by conscious neural activity.
a. True
b. False
37. The helicotrema is located beyond the tip of the cochlear duct.
a. True
b. False
38. Phasic receptors are rapidly adapting receptors.
a. True
b. False
39. The parasympathetic nervous system inhibits the rate of heartbeat.
a. True
b. False
40. Receptors can respond only to electrical stimulation.
a. True
b. False
41. Each cone contains three different photopigments for selectively responding to red, blue, or green wavelengths of light.
a. True
b. False
42. The autonomic nervous system is part of the somatic nervous system.
a. True
b. False
43. The term adequate stimulus refers to the intensity of a stimulus developing above a threshold value.
a. True
b. False
44. Binocular vision enhances depth perception.
a. True
b. False
45. Colour blindness may be caused by vitamin A deficiency.
a. True
b. False
46. The Pacinian corpuscle is sensitive mainly to temperature changes.
a. True
b. False
47. Prostaglandins suppress the sensitivity of nociceptors.
a. True
b. False
48. In the retina, photoreceptor cells do not synapse with bipolar cells.
a. True
b. False
49. The ossicular system transmits the vibrations of the tympanic membrane to the oval window, the movement of which sets up pressure waves in the cochlear fluid.
a. True
b. False
50. Receptor potentials can be graded, with a stronger stimulus resulting in a larger receptor potential.
a. True
b. False [Show Less]