If mesenchymal cells experience mutation during development, which of the following structures is most likely affected by the mutation?
A. Tendons
B. Bones
C. Cartilage
D. All of the choices are correct.
Answer: D
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Why do inhaled foreign objects lodge more frequently in the right main bronchus than the left?
A. Objects tend to be drawn toward the left main bronchus because air pressure is slightly lower in the left lung. B. The right main bronchus is more horizontal than the left. C. The right main bronchus is wider and more vertical than the left. D. The right main bronchus angles more sharply from the trachea. E. The right main bronchus is longer than the left.
Which muscle is not unique to the pelvic region?
A. gluteal B. rectus abdominis C. iliacus D. piriformis
Which of the following reduces alveolar surface tension?
A) gas B) surfactant C) water D) mucus
Closure of the tricuspid and mitral valves occur during:
A. ventricular relaxation. B. ventricular contraction. C. the diastolic phase. D. atrial contraction.