Visual Connection Questions

Figure 39.7 Which of the following statements about the mammalian respiratory system is false?

1. When we breathe in, air travels from the pharynx to the trachea.
2. The bronchioles branch into bronchi.
3. Alveolar ducts connect to alveolar sacs.
4. Gas exchange between the lung and blood takes place in the alveolus.

Figure 39.13 Which of the following statements is false?

1. In the tissues, {\text{P}}_{{\text{O}}_{\text{2}}} drops as blood passes from the arteries to the veins, while {\text{P}}_{{\text{CO}}_{\text{2}}} increases.
2. Blood travels from the lungs to the heart to body tissues, then back to the heart, then the lungs.
3. Blood travels from the lungs to the heart to body tissues, then back to the lungs, then the heart.
4. {\text{P}}_{{\text{O}}_{\text{2}}} is higher in air than in the lungs.

Figure 39.20 The kidneys are responsible for removing excess H+ ions from the blood. If the kidneys fail, what would happen to blood pH and to hemoglobin affinity for oxygen?