Question Video: Recalling How Oxygen is Delivered to Respiring Cells | Nagwa Question Video: Recalling How Oxygen is Delivered to Respiring Cells | Nagwa

Question Video: Recalling How Oxygen is Delivered to Respiring Cells Biology

Aerobic respiration requires oxygen. How is this oxygen delivered to cells for respiration?

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Video Transcript

Aerobic respiration requires oxygen. How is this oxygen delivered to the cells for respiration? (A) By red blood cells, (B) by white blood cells, (C) by chemical messengers, (D) by the nervous system, or (E) by active transport.

This question is asking about how oxygen is carried around the body for cells to use. Oxygen is initially taken into the body through the mouth and nose and then travels down through the trachea into the lungs. At the ends of the bronchioles in the lungs, there are little sacks called alveoli. These alveoli have a good blood supply so that oxygen from the inhaled air can diffuse from the alveoli into the blood. The oxygen then attaches to the hemoglobin in red blood cells and is carried throughout the body via the bloodstream.

So it is blood that carries and delivers oxygen to cells in other parts of the body, or specifically the red blood cells in the blood that do this job. Therefore, the correct answer is (A). Oxygen is delivered to cells for respiration by red blood cells.

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