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 B
Explanation
A. They are found only in lymph nodes
Lymphatic vessels are widespread throughout the body and not limited to lymph nodes.
B. They have large pores and follow the venous pathway
Lymphatic vessels have large, permeable walls and generally follow alongside veins, draining interstitial fluid back to circulation.
C. They closely follow the path of the aorta
Lymphatics follow venous, not arterial (aorta), pathways.
D. They are found only in the spleen
The lymphatic system is distributed systemically, not restricted to the spleen.
Correct Answer is A
Explanation
A. A disease-producing microorganism:
A pathogen is defined as a microorganism (such as bacteria, virus, fungus, or parasite) that causes disease.
B. The direction, or course, in which the disease progresses:
This describes the pathogenesis of a disease, not a pathogen.
C. A carcinogenic bacteria:
Not all pathogens are carcinogenic. Some may be, but the term "pathogen" simply refers to any disease-causing agent.
D. The generic name for various diseases:
A pathogen is not a name for diseases themselves but for the microorganisms that cause them.
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