Which blood vessel is marked with an X in the image below? Fill in the blank
The Correct Answer is {"dropdown-group-1":"D"}
Correct answer: Superior vena cava (SVC)
The SVC is the large vein that returns venous blood from the head, neck and upper limbs into the superior aspect of the right atrium; anatomically it appears as the large trunk entering the upper right side of the heart in chest models.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Bone marrow and the thymus: those are organs/tissues involved in blood cell production/maturation, not the formed elements themselves.
B. Blood and lymph: these are fluid compartments, not the formed cellular elements suspended in blood.
C. Blood cells and platelets: “formed elements” refers to erythrocytes, leukocytes, and platelets (the cellular/fragment components of blood).
D. Sodium and potassium: those are electrolytes/ions in plasma, not formed cellular elements.
Correct Answer is C
Explanation
A. Muscle contraction of upper airways: Upper airway muscle movement does not create the main pressure change driving inspiration
B. Partial pressure gradients for oxygen and carbon dioxide: Partial pressure gradients drive gas diffusion across membranes, not bulk airflow into lungs
C. Pressure gradient between atmosphere and alveoli: Contraction of the diaphragm/intercostals lowers intrapulmonary pressure relative to atmospheric pressure, causing air to flow in
D. Concentration gradients for oxygen and carbon dioxide: Concentration gradients drive diffusion at the alveolar–capillary level, not the gross movement of air into the lungs
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