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The posterior inferior vena cava is indicated by the letter _____. (Activity 42A) 
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| A |
| B |
| C |
| D |
| E |
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Arteries carry blood _____. (Activity 42A)
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| away from capillaries |
| away from the heart and away from the lungs |
| to the heart and away from the lungs |
| to the heart only |
| away from the heart only |
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Blood returns to the heart via the _____.(Activity 42A) and (Activity 42B)
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| aorta |
| pulmonary arteries |
| pulmonary veins |
| aorta and pulmonary arteries |
| aorta and pulmonary veins |
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From the pulmonary veins, blood flows to the _____. (Activity 42A) and (Activity 42B)
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| right atrium |
| left atrium |
| aorta |
| capillaries of the lungs |
| posterior vena cava |
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From the anterior vena cava, blood flows to the _____. (Activity 42A) and (Activity 42B)
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| right atrium |
| left atrium |
| aorta |
| capillaries of the lungs |
| posterior vena cava |
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From the capillaries of the abdominal organs and hind limbs, blood flows to the _____. (Activity 42A) and (Activity 42B)
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| right atrium |
| left atrium |
| aorta |
| capillaries of the lungs |
| posterior vena cava |
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Carbon dioxide enters the blood at the _____. (Activity 42C)
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| capillaries of the lungs |
| capillaries of the abdominal organs |
| capillaries of the hind limbs |
| capillaries of the head and forelimbs |
| capillaries of the head, forelimbs, abdominal organs, and hind limbs |
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The _____ has(have) the thinnest walls. (Activity 42C)
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| aorta |
| capillaries |
| posterior vena cava |
| pulmonary artery |
| right ventricle |
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Blood pressure is highest in the _____. (Activity 42C)
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| aorta |
| posterior vena cava |
| anterior vena cava |
| pulmonary artery |
| capillaries |
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Most gas exchange with blood vessels occurs across the walls of the structure indicated by the letter _____. (Activity 42C) 
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| A |
| B |
| C |
| D |
| E |
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Voice sounds are produced by the _____. (Activity 42D)
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| trachea |
| diaphragm |
| bronchioles |
| larynx |
| lungs |
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The primary functions of the _____ are to warm, filter, and humidify air. (Activity 42D)
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| lungs |
| trachea |
| bronchus |
| nasal cavity |
| alveoli |
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Most carbon dioxide is carried from the body tissues to the lungs _____. (Activity 42E)
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| as bicarbonate ions (HCO3-) |
| combined with hemoglobin |
| by the trachea |
| as hydrogen ions (H+) |
| dissolved in blood plasma |
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By picking up hydrogen ions, hemoglobin prevents the blood from becoming too _____. (Activity 42E)
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| acidic |
| basic |
| thick |
| low in oxygen concentration |
| red |
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In the blood most of the oxygen that will be used in cellular respiration is carried from the lungs to the body tissues _____. (Activity 42E)
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| as bicarbonate ions (HCO3-) |
| combined with hemoglobin |
| by the trachea |
| water (H2O) |
| dissolved in blood plasma |
