The main muscle responsible for pulmonary ventilation is?.
External intercostals.
Abdominals.
Internal intercostals.
Diaphragm.
The Correct Answer is D
hoice A rationale:
External intercostals assist in inspiration by elevating the ribs and expanding the chest cavity.
Choice B rationale:
Abdominals are not the main muscles responsible for pulmonary ventilation.
Choice C rationale:
Internal intercostals assist in forced expiration.
Choice D rationale:
The diaphragm is the main muscle responsible for pulmonary ventilation.
So, the correct answer is Choice D, after analyzing all choices.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
The glottis is the space between the vocal cords and does not direct food and liquids into the esophagus during swallowing.
Choice B rationale:
The Adam’s apple, also known as the thyroid cartilage, is a structure in the neck and does not direct food and liquids into the esophagus during swallowing.
Choice C rationale:
The conchae are structures in the nasal cavity and do not direct food and liquids into the esophagus during swallowing.
Choice D rationale:
The epiglottis is responsible for directing food and liquids into the esophagus during swallowing. It acts as a lid over the windpipe, preventing food from entering the lungs.
Correct Answer is A
Explanation
Choice A rationale:
Hemoglobin is an iron-containing biomolecule that binds oxygen and is responsible for the red color of the cells and the blood. -
Choice B rationale:
Hematocrit is not an iron-containing component, but rather a measure of the proportion of blood volume that is occupied by red blood cells. -
Choice C rationale:
Cytoplasm is the fluid inside the cell where cellular components are suspended, but it does not contain iron. -
Choice D rationale:
The nucleus is not present in mature red blood cells.
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