57. Which part of the respiratory system is composed ofC-shaped cartilaginous ri

Question

57. Which part of the respiratory system is composed ofC-shaped cartilaginous rings and cilia? a. pharynx b. larynx c. trachea d. bronchioles e. alveolicavity-pharynx-glottis-trachea-larynx-bronchi-bronchioles-alveoli 58. The greatest surface area for gas exhange occurs withinthe a. trachea b. bronchi c. bronchioles d. alveoli 59. Which association is not correct? a. larynx--voice box b. trachea-windpipe c. alveoli-gas exchange d. pharynx-vocal cords e. hair and mucus--nasal passages 60. In humans, the lungs are caused to inflate when the a. rib muscles contract b. diaphragm muscle contracts c. rib muscles and diaphragm contract d. diaphragm relaxes e. rib muscles and diaphragm relax 61. Oxygen is transported in blood most efficiently by a. being dissolved in the plasma b. chemical conversion to water c. combining with hemoglobin d. combining with carbon dixoide to form bicarbonateions 62. How is most carbon dioxide transported in the blood? a. as gas bubbles of CO2, just as in carbonated softdrinks b. as bicarbonate ions (HCO3) c. on the free hemoglobins since they have lost their oxygenin the tissues d. as carbon monoxide e. as carbon compounds and oxygen radicals 57. Which part of the respiratory system is composed ofC-shaped cartilaginous rings and cilia? a. pharynx b. larynx c. trachea d. bronchioles e. alveolicavity-pharynx-glottis-trachea-larynx-bronchi-bronchioles-alveoli 58. The greatest surface area for gas exhange occurs withinthe a. trachea b. bronchi c. bronchioles d. alveoli 59. Which association is not correct? a. larynx--voice box b. trachea-windpipe c. alveoli-gas exchange d. pharynx-vocal cords e. hair and mucus--nasal passages 60. In humans, the lungs are caused to inflate when the a. rib muscles contract b. diaphragm muscle contracts c. rib muscles and diaphragm contract d. diaphragm relaxes e. rib muscles and diaphragm relax 61. Oxygen is transported in blood most efficiently by a. being dissolved in the plasma b. chemical conversion to water c. combining with hemoglobin d. combining with carbon dixoide to form bicarbonateions 62. How is most carbon dioxide transported in the blood? a. as gas bubbles of CO2, just as in carbonated softdrinks b. as bicarbonate ions (HCO3) c. on the free hemoglobins since they have lost their oxygenin the tissues d. as carbon monoxide e. as carbon compounds and oxygen radicals

Explanation / Answer

57. C The trachea is composed of C-shaped cartilaginousrings to prevent it from collapsing. The cilia sweepsup fluid and foreign particles to prevent them from enteringthe lungs. 58. D Alveoli are the final branching of the respiratorytree and primary site for gas exchange. 59. D Vocal cords are in the larynx. 60. C Inspiration results primarily from contraction ofthe diaphram. This increases thoracic volume. Inspiration is also aided by contraction of the rib muscles. The increase in volume in the thorax and the lungs creates a lowerair pressure than the outside, thereby "sucking" in the air. 61. C Hemoglobin contain four polypeptide chains that iscombined with heme groups. Each of these four heme groupscontain iron in the reduced form which can share electrons and bindwith oxygen. 62. B CO2 is transported in the blood primarily inthe form of bicarbonate ions.

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