Which of the following is second line of defense?
Skin
Phagocytosis
Coughing
Sneezing
The Correct Answer is B
A. Skin:
The skin is part of the first line of defense, acting as a physical barrier.
B. Phagocytosis:
Phagocytosis, carried out by white blood cells like macrophages and neutrophils, is a component of the second line of defense, which includes non-specific internal immune responses.
C. Coughing:
Coughing is part of the first line of defense-mechanical clearance.
D. Sneezing:
Like coughing, sneezing is a mechanical defense included in the first line.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. RBCs:
Red blood cells (RBCs) carry oxygen and have no role in the immune response.
B. T cells:
T cells are classified into subsets like cytotoxic (killer), helper, memory, and suppressor (regulatory) T cells, each with specialized immune functions.
C. B cells:
While B cells also have memory capabilities and produce antibodies, they are not categorized into killer or suppressor types.
D. Platelets:
Platelets are involved in blood clotting, not immunity.
Correct Answer is D
Explanation
A. Worm
Worms (helminths) are parasitic but can live independently of a host temporarily in certain environments.
B. Fungi
Fungi can survive and reproduce in non-living environments like soil or dead organic matter.
C. Arthropod
Arthropods (e.g., mosquitoes, ticks) can live freely and act as vectors but do not require a host to survive.
D. Virus
Viruses are obligate intracellular parasites and must infect a living host cell to reproduce and
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