True-False Write T if the statement is true and F if the statement is false. 41.
ID: 3518670 • Letter: T
Question
True-False Write T if the statement is true and F if the statement is false. 41. Smell is our least understood special sense. 42. Microscopically, ofactory receptors are unipolar neurons. 43. Only a few molecules of certain substances need to be present in air to be smelled 44. The first synapse of the olfactory pathway occurs in the frontal lobe. 45. Projection of the ofactory pathway to the limbic system probably accounts for our emotional and memory-evoked responses to odors. 46. Much of what we perceive as taste is actually smell. 47. Fungilform papilae cover the anterior two-thirds of the tongue, and rarely contain taste buds. 48. The lateral edges of the tongue are more sensitive to sweet substances than to the other substances 49. The threshold for taste of bitter substances is the lowest of the four tastes. 50. In response to sympathetic stimulation, the lacrimal glands produce excessive tears 51. Even though the human eye in the skull shows very little sclera, the sclera is a white, dense connective tissue that covers all parts of the eyeball. 52. The cornea is avascular, and therefore, does not have circulating antibodies 53. Epithelial lining cells of the retina secrete aqueous humor.Explanation / Answer
Answer 41. Given statement is true statement. It is true that the smell is our least understood special senses. We can not differentiate the minute change of smell sensation. The more concentration of any molecules are required to be smelled better. The olfactory receptors are ill defined.
Answer 42. It is false statement because microscopically the olfactory receptor are bipolar in nature and not unipolar. Bipolar neurons have cell body in the center of the neurons and the signal is transmitted in two directions. While unipolar neurons has only one projection and one direction of signal transmission.
Answer 43. False statement because more concentration of the molecules are required to be present in the air and to be smelled. A threshold amount of substance are required to produce a action potential in the olfactory neuron. This generation of action potential is required for smelling of any substance.
Answer 44. False statement because the first synapse of the olfaction occurs in olfactory bulb not in the frontal lobe. The first synapse takes place between the axon terminal of olfactory nerves and post synaptic neuron in the olfactory bulb.
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