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Which body system is considered the MAIN first line of defense against invasion of the body from foreign objects?

A.

Cardiovascular

B.

Integumentary

C.

Urinary

D.

Endocrine

Answer and Explanation

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.


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Related Questions

Correct Answer is A

Explanation

A. Shingles

Shingles (herpes zoster) occurs when the varicella-zoster virus reactivates from latency in nerve ganglia, typically many years after initial infection with chickenpox.

B. Measles

Measles is caused by the rubeola virus and is not related to herpes varicella zoster.

C. Smallpox

Smallpox is caused by the variola virus, which is entirely different from the herpesvirus group.

D. Mumps

Mumps is caused by a paramyxovirus and is unrelated to varicella-zoster.

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.

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