Question Video: Identifying the Source of Glucose for Aerobic Respiration | Nagwa Question Video: Identifying the Source of Glucose for Aerobic Respiration | Nagwa

Question Video: Identifying the Source of Glucose for Aerobic Respiration Biology

Aerobic respiration in humans requires a supply of glucose. Where does this glucose come from?

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Video Transcript

Aerobic respiration in humans requires a supply of glucose. Where does this glucose come from? (A) From inhalation of gases from the atmosphere. (B) From the breakdown of dead cells. (C) From water in the person’s diet. (D) From food in the person’s diet.

Cellular respiration is the process of converting energy in glucose to ATP to provide energy for our cells. There are two types of cellular respiration, aerobic and anaerobic. Aerobic respiration requires the use of oxygen, while anaerobic does not. In aerobic respiration, glucose is combined with oxygen to make carbon dioxide, water, and energy in the form of ATP. Glucose is a six-carbon molecule with a ring structure as shown here. This question is asking us where we receive glucose. So let’s go over the answer choices to determine the best option.

In answer choice (A), we do not receive glucose from inhaling gases. This is how we receive oxygen, which is also required for aerobic respiration. So this answer is incorrect.

In answer choice (B), we do not get glucose from the breakdown of dead cells. It may be possible to do this. But this isn’t how our body primarily receives glucose.

In answer choice (C), glucose isn’t made from water. Water contains hydrogen and oxygen but no carbon atoms that are found in glucose.

In the final option, we do get glucose from our diet. Foods like carbohydrates can supply our body with high levels of glucose for aerobic respiration. Therefore, where glucose comes from is given by answer choice (D), from food in the person’s diet.

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