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The respiratory system contains which of the following structures and organs? A. blood, blood vessels, heart B. tonsils, thymus, spleen, red bone marrow C. lymph nodes, lymph vessels D. lungs, respiratory
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The respiratory system contains which of the following structures and organs? A. blood, blood vessels, heart B. tonsils, thymus, spleen, red bone marrow C. lymph nodes, lymph vessels D. lungs, respiratory passages, diaphragm

User Buczkowski
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Its D. You Require All That To Breathe
User Dmytro Grynets
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The answer is D. Respiratory system = breathing system. Keep that in mind.
User George Artemiou
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