Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
What is the iron-containing component of a red blood cell?.
A. Hemoglobin.
Hemoglobin is an iron-containing biomolecule that binds oxygen and is responsible for the red color of the cells and the blood. -
B. Hematocrit.
Hematocrit is not an iron-containing component, but rather a measure of the proportion of blood volume that is occupied by red blood cells. -
C. Cytoplasm.
Cytoplasm is the fluid inside the cell where cellular components are suspended, but it does not contain iron. -
D. Nucleus.
The nucleus is not present in mature red blood cells.
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Full 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.
Similar Questions
Which of the following is the correct order of the protective meningeal layers of the brain from inside to outside?.
A. Arachnoid, Pia mater, dura mater.
The arachnoid is not the innermost layer, it is in the middle. -
B. Pia mater, arachnoid, dura mater.
The correct order of the meninges from inside to outside is Pia mater, arachnoid, and dura mater. -
C. Dura mater, Pia mater, arachnoid.
The dura mater is not the innermost layer, it is the outermost layer. -
D. Arachnoid, dura mater, gray mater.
Gray matter is not a layer of the meninges.
Full Explanation
Choice A rationale:
The arachnoid is not the innermost layer, it is in the middle. -
Choice B rationale:
The correct order of the meninges from inside to outside is Pia mater, arachnoid, and dura mater. -
Choice C rationale:
The dura mater is not the innermost layer, it is the outermost layer. -
Choice D rationale:
Gray matter is not a layer of the meninges.
Which of the following structures prevents food from being aspirated into the lungs?.
A. Larynx.
The larynx is part of the airway but does not prevent aspiration. -
B. Trachea.
The trachea is the airway leading to the lungs but does not prevent aspiration. -
C. Epiglottis.
The epiglottis is a flap of tissue that covers the airway during swallowing, preventing food from entering the lungs. -
D. Pharynx.
The pharynx is part of the throat but does not prevent aspiration.
Full Explanation
The correct answer is Choice C. -
Choice A rationale:
The larynx is part of the airway but does not prevent aspiration. -
Choice B rationale:
The trachea is the airway leading to the lungs but does not prevent aspiration. -
Choice C rationale:
The epiglottis is a flap of tissue that covers the airway during swallowing, preventing food from entering the lungs. -
Choice D rationale:
The pharynx is part of the throat but does not prevent aspiration.
So, the correct answer is C, after analyzing all choices.
What is a structure of the inner ear?.
A. Tragus.
The tragus is a small pointed eminence of the external ear, not a structure of the inner ear. -
B. Cerumen.
Cerumen, also known as earwax, is produced in the outer ear, not the inner ear. -
C. Cochlea.
The cochlea is a part of the inner ear and is involved in hearing. -
D. Helix.
The helix is the rim of the external ear, not a structure of the inner ear.
E. .
Full Explanation
The correct answer is Choice C. -
Choice A rationale:
The bicuspid valve, also known as the mitral valve, prevents backflow from the left ventricle to the left atrium. -
Choice B rationale:
The semilunar valves include the aortic and pulmonary valves, but neither prevents backflow into the right atrium. -
Choice C rationale:
The tricuspid valve prevents backflow from the right ventricle to the right atrium. -
Choice D rationale:
The aortic valve prevents backflow from the aorta to the left ventricle.