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- The ________ is an airway that connects the nose and mouth with the ________. a. oral cavity; larynx b. pharynx; trachea c. trachea; pharynx d. pharynx; larynxFigure 16.9 Which of the following statements about the human respiratory system is false? a. When we breathe in, air travels from the pharynx to the trachea. b. The bronchioles branch into bronchi. c. Alveolar ducts connect to alveolar sacs. d. Gas exchange between the lungs and blood takes place in the alveolus.Figure 39.7 Which of the following statements about the mammalian respiratory system is false? When we breathe in, air travels from the pharynx to the trachea. The bronchioles branch into bronchi. Alveolar ducts connect to alveolar sacs. Gas exchange between the lung and blood takes place in the alveolus.
- Alveoli is related to which of thefollowing system of human body?A. Circulatory systemB. Excretory systemC. Reproductive systemD. Respiratory systemThis structure blocks the opening to the respiratory system duringswallowing.a. esophagus c. epiglottisb. pharynx d. salivary glandOur throat divides into two separate tubes: the windpipe and the gullet. What prevents food from entering the windpipe? The uvula The tongue The trachea The epiglottis
- The tubes that lead into the lungs from the trachea are called: A) BronchiolesB) AlveoliC) Pulmonary VeinsD) EsophagusAir is pulled into the human respiratory tract mainly because ofvolume changes in thea. nose. c. chest cavity.b. pharynx. d. trachea.These microscopic air sacs in your lungs are where the blood picks up oxygen to return it to the heart: A) AlveoliB) Bronchial TubesC) CapillariesD) Ventricles
- Which of the following is NOT the function of the respiratory system?a) Regulate blood pHb) Helps in gaseous exchangec) Protection against blood lossd) Contains receptors for the sense of smellEvolution Connection Lizards and snakes cannotbreathe while chewing food because the connection betweentheir external nostrils and their esophagus is in the mouth.In contrast, mammals can continue breathing throughthe nostrils while chewing food in the mouth. However,choking sometimes occurs when the paths of air and foodcross each other. Thinking about the high oxygen demandof active endotherms, explain how the concept of descentwith modification explains this “imperfect” anatomy of someamniotes (see Figure 34.2 to review vertebrate phylogeny).A broken rib can sometimes puncture a lung, causing it to collapse. Acollapsed lung leaks air into the chest cavity. Why might it be difficultfor a person to fully expand a collapsed lung?