Cervical lymph nodes filter lymph draining from what region?
Abdominal viscera
Upper limb and mammary gland
Thoracic viscera
Scalp and face
The Correct Answer is D
A. Abdominal viscera: abdominal viscera are drained by mesenteric and lumbar nodes, not cervical nodes.
B. Upper limb and mammary gland: the axillary lymph nodes primarily drain the upper limb and breast.
C. Thoracic viscera: mediastinal and tracheobronchial nodes drain thoracic viscera.
D. Scalp and face: cervical lymph nodes drain lymph from the head and neck region, including the scalp and face.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Macrophages: macrophages are professional phagocytes that engulf pathogens, debris, and dead cells.
B. Lymphocytes: lymphocytes mainly provide adaptive immune responses (antibody production, cell-mediated cytotoxicity), not primary phagocytosis.
C. Erythrocytes: red blood cells transport oxygen and do not phagocytose.
D. Mast cells: mast cells release histamine and inflammatory mediators; they are not primary phagocytes.
Correct Answer is A
Explanation
A. The AV valves are closing: This occurs at S₁ (first heart sound) at the start of ventricular systole.
B. The semilunar valves are closing: Semilunar valves close at S₂ (second heart sound), not S₁.
C. The AV valves are opening: AV valves open during ventricular diastole (filling), not at S₁.
D. The semilunar valves are opening: Semilunar valves open during ventricular ejection (systole) but their opening is not what produces S₁.
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