Which body system is considered the MAIN first line of defense against invasion of the body from foreign objects?
Cardiovascular
Integumentary
Urinary
Endocrine
The Correct Answer is B
A. Cardiovascular
The cardiovascular system transports blood and immune cells but is not a barrier against pathogens.
B. Integumentary
The skin and mucous membranes form the first physical barrier, preventing pathogen entry.
C. Urinary
The urinary system flushes out pathogens but is not the primary barrier to entry.
D. Endocrine
The endocrine system regulates hormones, not involved in first-line defense.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Infection:
The elevated WBC count and abnormal differential, along with symptoms of fever and chills, point to an active infection, which is consistent with recent exposure to ill children and no flu vaccine.
B. Thrombocytopenia:
Thrombocytopenia refers to a low platelet count, which was not provided or implied in the lab data.
C. Leukemia:
While leukemia can cause elevated WBCs, this client’s clinical picture fits a common infection, and leukemia typically presents with more severe or chronic symptoms and abnormal blood cell morphology.
D. Anemia:
The client’s hemoglobin and hematocrit are above normal, which rules out anemia.
Correct Answer is A
Explanation
A. Tonsils:
Tonsils are lymphatic tissues located in the pharyngeal region; they are partially encapsulated and help trap airborne or ingested pathogens.
B. Thyroid gland:
The thyroid is an endocrine gland that regulates metabolism, not part of the lymphatic system.
C. Thymus gland:
The thymus is fully encapsulated and located in the mediastinum; it matures T cells.
D. Spleen:
The spleen is a fully encapsulated lymphoid organ located in the left upper quadrant of the abdomen.
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