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 A
Explanation
A. pepsin: pepsin (activated from pepsinogen) is the primary enzyme that begins protein digestion in the stomach.
B. amylase: amylase digests carbohydrates, primarily in the mouth/small intestine, not proteins in the stomach.
C. intrinsic factor: intrinsic factor (from parietal cells) is needed for vitamin B₁₂ absorption, not protein digestion.
D. lipase: lipase digests fats; gastric lipase plays a minor role but is not the main stomach protease.
Correct Answer is B
Explanation
A. To produce enzymes that dissolve blood clots: fibrinolytic enzymes (e.g., plasmin) handle clot breakdown; lymphocytes are not responsible for that.
B. To act against foreign substances: lymphocytes (B cells, T cells, NK cells) are central to adaptive immunity and target pathogens/foreign antigens.
C. To phagocytize damaged cells: phagocytosis is mainly done by macrophages and neutrophils, not lymphocytes.
D. To release substances that initiate blood clots: platelets and clotting factor pathways initiate clotting; lymphocytes do not.
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