Mucus, tears, saliva, and hair are all examples of what type of defense against potential pathogens?
Mononuclear phagocytic system
Chemical barriers
Adaptive defenses
Mechanical barriers
The Correct Answer is D
A. Mononuclear phagocytic system: that system (macrophages/monocytes) performs cellular phagocytosis, not the physical barriers listed.
B. Chemical barriers: some secretions (tears, saliva) contain chemical antimicrobials, but the items listed (mucus, hair) are primarily physical/mechanical barriers.
C. Adaptive defenses: adaptive defenses are specific immune responses (antibodies, T cells), not the nonspecific physical barriers listed.
D. Mechanical barriers: mucus, hair, and the physical flow of tears/saliva act as mechanical/physical barriers that trap or remove pathogens before they invade.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Megakaryocytes: Megakaryocytes are large bone marrow cells whose cytoplasmic fragments become platelets (thrombocytes).
B. Macrophages: Phagocytic cells derived from monocytes; they do not produce platelets.
C. Monoblasts: Immature precursors that develop into monocytes/macrophages, not platelets.
D. Reticulocytes: Immature red blood cells (RBC precursors) released from bone marrow—not a source of platelets.
Correct Answer is D
Explanation
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.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.