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7. (a) (i) Name one muscle involved in breathing - Leaving Cert Biology - Question 7 - 2004

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7. (a) (i) Name one muscle involved in breathing. (ii) In which structures does gas exchange occur in the lungs? (b) You investigated the effect of exercise on ... show full transcript

Worked Solution & Example Answer:7. (a) (i) Name one muscle involved in breathing - Leaving Cert Biology - Question 7 - 2004

Step 1

Name one muscle involved in breathing.

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Answer

One muscle involved in breathing is the diaphragm.

Step 2

In which structures does gas exchange occur in the lungs?

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Answer

Gas exchange occurs in the alveoli, which are tiny air sacs in the lungs.

Step 3

How did you measure the resting rate?

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Answer

To measure the resting rate, I counted the number of breaths taken in one minute. This can be done by observing the rise and fall of the chest or by placing a hand on the abdomen.

Step 4

After measuring the resting rate, what other steps did you carry out to complete the investigation?

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Answer

After measuring the resting rate, I instructed the participants to engage in a specified exercise, such as jogging in place, for a set duration. Following the exercise, I measured their breathing rates again to compare with the resting rates.

Step 5

Use the table to identify the:

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Answer

Unfit student = B
Fit student = A

Step 6

Give a reason for your choice.

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Answer

The unfit student’s breathing rate increases by a much larger margin compared to the fit student’s rate, indicating lower fitness levels.

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