Question

49) Olfactory Receptors a) Can be classified based on specific smell b) Cannot be classified based on smells c) Belong to less than 100 different categories d) None of the above 50) Photoreceptors a) Are the only type of sensory receptor in the eye b) Sense and encode light patterns c) Respond only to bright light d) Respond only to dim light 51) Cones specifically respond to three colors of light, these colors are: a) Red, yellow and green b) Green, yellow and blue c) Blue, green and red d) None of the above 52) Myopia can occur: a) Because the eye is to short b) Because the eye is to long c) Because the cornea or lens is irregularly shaped d) Because the retina becomes detached e) None of the above 53) Nicotine easily crosses the blood-brain barrier. a) True b) False 54) The cranial nerve that functions in olfaction is: a) Cranial Nervel b) Cranial Nerve VII c) Cranial Nerve X d) Cranial Nerve VIII 55) The biceps brachii is innervated by the: a) Phrenic nerve b) Musculocutaneous nerve c) Radial Nerve d) Femoral Nerve

Answer 1

Answer:

49. B) can not be classified based on smells

Explanation: There are a large number of different odor receptors, with as many as 1,000 in the mammalian genome which represents approximately 3% of the genes in the genome.

- each odor receptor does not detect a single odor.

50. A) Are the only type of sensory receptors in the eye

Explanation: There are currently three known types of photoreceptor cells in mammalian eyes: rods, cones, and intrinsically photosensitive retinal ganglion cells.

51. c) Blue, green and red

Explanation:  cones consist one of the three types of pigment namely: S-cones (absorbs blue), M-cones (absorbs green) and L-cones (absorbs red).

52. B) Because the ye is too long

Explanation: Myopia, or short-sightedness, occurs when the eyeball is too long so it affects how the cornea and lens focus.

53. True

Explanation: Nicotine is a toxic substance which because of its lipid solubility can cross the blood brain barrier.

54. a) Cranial Nerve I

Explanation: Cranial nerve is the olfactory nerve that sense the smell.

55. b) Musculocutaneous nerve

Explanation: The biceps shares its nerve supply with the other two muscles of the anterior compartment. The muscles are supplied by the musculocutaneous nerve.