Question Video: Identifying the Situation Where Aerobic Respiration Is Likely to Be Used | Nagwa Question Video: Identifying the Situation Where Aerobic Respiration Is Likely to Be Used | Nagwa

# Question Video: Identifying the Situation Where Aerobic Respiration Is Likely to Be Used Biology • Second Year of Secondary School

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Which of the following examples is a situation where the muscle cells in the body are most likely to be relying mainly on aerobic respiration to supply their energy requirements? [A] A person running a marathon distance of 26 miles over 4 hours. [B] A child sprinting 50 meters down a hallway in 8 seconds. [C] A rabbit in a garden spotting a fox and immediately jumping away.

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### Video Transcript

Which of the following examples is a situation where the muscle cells in the body are most likely to be relying mainly on aerobic respiration to supply their energy requirements? (A) A person running a marathon distance of 26 miles over four hours. (B) A child sprinting 50 meters down a hallway in eight seconds. (C) A rabbit in a garden spotting a fox and immediately jumping away.

Cellular respiration is the process of converting the energy in glucose to ATP for our cells. It can occur in either the presence or absence of oxygen. Aerobic respiration uses oxygen and is often the favored process because it produces a large amount of ATP per glucose molecule. However, sometimes oxygen is not available for this process to occur. When there’s no oxygen available, the body will utilize anaerobic respiration in order to continue generating energy.

Now that we have reviewed how the body generates energy, we can take another look at our question.

We are presented with three situations requiring energy. The first situation describes a person running a marathon over the course of four hours. Because these energy demands are spread over a long period of time, this person should be able to get enough oxygen for aerobic respiration. So this seems to be the correct answer, but let’s look at the other two choices to be sure.

The second situation involves a child sprinting down a hallway, which would require a burst of energy in a short amount of time. Because this child requires high amounts of energy over a period of eight seconds, it’s unlikely they’ll be able to take in enough oxygen to meet this demand. So the child’s cells are likely using anaerobic respiration. And this answer is incorrect.

In the last situation, a rabbit immediately jumps away after spotting a fox. This is similar to the child sprinting down the hallway, because the rabbit will need to use high amounts of energy in a short period of time. So an adequate amount of oxygen is unlikely to be delivered to the cells in this time, and anaerobic respiration will predominate. So this answer is incorrect.

Therefore, the option that correctly identifies aerobic respiration is given by answer choice (A): a person running a marathon distance of 26 miles over four hours.

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