1. Which statement best describes the role of the lung in gas exchange?
A. It takes in oxygen from the bloodstream.
B. It produces carbon dioxide as a waste product of cellular respiration.
C. It extracts oxygen from the atmosphere for use by body cells.
D. It provides carbon dioxide to the capillaries.
2007-03-26 08:06:11 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
C
2007-03-26 08:11:12 · answer #1 · answered by Erik S 2 · 0⤊ 0⤋
C. the most important fn. of the lungs is gas exchange. it takes in oxygen from the atmosphere and saturates the haemoglobin in the blood to be sent to the various tissues in the body which require the same for vital metabolic processes and at the same time withdraw the carbon dioxide brought to the alveoli in the lung through blood from the tissues where it formed as a waste metabolite.
2007-03-26 15:26:15 · answer #2 · answered by rara avis 4 · 0⤊ 0⤋
The answer your teacher wants is
C
It does all the other things too, but its primary purpose is in bringing atmospheric oxygen close to capillaries for absorption by the red blood cells.
2007-03-26 15:28:39 · answer #3 · answered by Anonymous · 0⤊ 0⤋
C.
C6O12H6 (sugar/glucose) + O2 = Co2 + H2O
2007-03-26 15:13:11 · answer #4 · answered by speedydasher47 2 · 0⤊ 0⤋