Each hemoglobin molecule can transport up to ________ oxygen molecules.
5
4
2
6
3
The Correct Answer is B
A. 5: Hemoglobin molecules do not bind five oxygen molecules; this exceeds their structural capacity.
B. 4: Each hemoglobin molecule has four heme groups, and each heme can bind one oxygen molecule. Therefore, one hemoglobin molecule can carry a maximum of four oxygen molecules.
C. 2: Hemoglobin can carry more than two oxygen molecules; two would only represent half-saturation of the molecule.
D. 6: Six oxygen molecules exceed the binding capacity of hemoglobin and are not physiologically possible.
E. 3: Hemoglobin can bind three oxygen molecules, but this is not the maximum capacity. Four is the full complement when fully saturated.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Small-cell carcinoma:Small-cell lung carcinoma (SCLC) is the least common type of lung cancer but is highly aggressive. It grows rapidly, often metastasizes early, and is strongly associated with smoking. Its prognosis is generally poor due to late detection and rapid progression.
B. Adenocarcinoma:Adenocarcinoma is the most common type of lung cancer, especially in non-smokers. Although serious, it typically progresses more slowly than small-cell carcinoma and has a better prognosis when detected early.
C. Squamous cell carcinoma:Squamous cell carcinoma arises from the bronchial epithelium and is often linked to smoking. It is more common than small-cell carcinoma and tends to grow more slowly, making it less immediately dangerous.
D. Mesothelioma:Mesothelioma is a rare cancer of the pleura, primarily caused by asbestos exposure. While deadly, it is not classified as a primary lung carcinoma and is less common than SCLC.
E. Basal cell carcinoma:Basal cell carcinoma is a skin cancer and does not originate in the lungs. It is not relevant to pulmonary malignancies.
Correct Answer is D
Explanation
A. Segmental bronchi:Each lung contains multiple segmental (tertiary) bronchi-10 in the right lung and 8–10 in the left lung. They serve individual bronchopulmonary segments, so their total exceeds five.
B. Choanae:The choanae are the paired posterior nasal apertures connecting the nasal cavity to the pharynx. There are only two, not five, and they are unrelated to the lungs.
C. Laryngeal cartilages:The larynx has several cartilages (e.g., thyroid, cricoid, arytenoid), but they number more than five and are part of the upper airway, not the lungs.
D. Lobes:The lungs are divided into five lobes total: three in the right lung (superior, middle, inferior) and two in the left lung (superior, inferior). Lobes are anatomical subdivisions important for lung function and clinical localization.
E. Tracheal cartilages:The trachea contains 16–20 C-shaped cartilaginous rings, which are far more than five. These rings support the trachea but do not describe lung anatomy.
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