Which of the following is the dome-shaped muscle that is the chief muscle of inhalation?
Diaphragm
Pectoris minor
Pectoris major
Intercostals
The Correct Answer is A
A. Diaphragm: The diaphragm is a dome-shaped muscle that contracts and flattens during inhalation, creating negative pressure to draw air into the lungs.
B. Pectoris minor: The pectoralis minor assists with deep or labored breathing but is not the primary muscle of inhalation.
C. Pectoris major: This chest muscle plays a role in arm movement and may assist minimally in labored breathing.
D. Intercostals: The intercostal muscles assist with breathing but are secondary to the diaphragm.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Larynx: The larynx is located below the pharynx and above the trachea. It houses the vocal cords and plays a role in speech. In the diagram, the larynx is likely structure #6, not #4.
B. Pharynx: The pharynx is a muscular passageway for food and air. It lies behind the nasal cavity and mouth, connecting them to the larynx and esophagus. Structure #4 is positioned in that area, making it the correct answer.
C. Trachea: The trachea is the windpipe that extends from the larynx downward into the chest. It is shown lower in the diagram (likely structure #7), not #4.
D. Nose: The nose (including the nostrils and nasal cavity) is the outermost and uppermost part of the respiratory tract. In the diagram, structure #3 appears to represent the nose, not #4.
Correct Answer is A
Explanation
A. CO₂: High CO₂ (hypercapnia) stimulates the respiratory center to increase breathing.
B. Volume: Blood volume doesn't directly affect respiratory rate.
C. Bilirubin: This is associated with liver function and jaundice, not respiration.
D. Calcium: Calcium levels affect muscle function, not the breathing rate directly.
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