Question

Kristen is running half a marothon. By her tenth minute of running her breathing rate has increased from her resting rate. How are her tissues responding to her running.

Answer 1

Answer: The tissues of the body needs more oxygen after some time of running.

Explanation:

Kristen is running half of the marathon. After some time of running the when the body is running out of oxygen then the muscles of the body will require more oxygen.

The oxygen is being consumed inside the body more fastly as compared to the inhaled oxygen.

In this case the breathing rate increases in order to increase rate of gaseous exchange. This is done to fulfill the oxygen requirement of the body.

Answer 2

The question is incomplete as it does not have the options which are:

1. They need more oxygen to function, so gas exchange needs to decrease.
2. They need more oxygen to function, so gas exchange needs to increase.  
3. They need more carbon dioxide to function, so gas exchange needs to increase.  
4. They need more carbon dioxide to function, so gas exchange needs to decrease.

Answer:

They need more oxygen to function, so gas exchange needs to increase.  Explanation:

In the given question, Kristen is doing physical exercise for a long time as she is running in half marathon.

As a result of continuous running her breathing rate has increased because the physical exercise requires energy in the form of ATP.

The formation of ATP in the body is the result of the cellular respiration which takes place in the mitochondria which require oxygen and oxygen in the body is inhaled only through the breathing. So, more production of the ATP requires more oxygen and therefore more breathing.

Thus, the selected option is correct.