Which organ is most responsible for oxygen entering the blood stream?
A B C D
nose trachea bronchi lungs
Question: Which organ is most responsible for oxygen entering the blood stream?
(A) nose
(B) trachea
(C) bronchi
(D) lungs

Answer: (D) lungs
Answer: (C) bronchi
Question: Which organ is most responsible for oxygen entering the blood stream?
(A) nose
(B) trachea
(C) bronchi
(D) lungs
Answer: (D) lungs