OCR A level Biology Question - thanks

Hi,
Unfortunately I cannot see the units or numbers clearly to give you a precise measurement. I presume for question a) the volume decreased because the expiratory volume is now lower than the inspiratory volume. This means the person is inhaling more than exhaling, but there seems to be some sort of air leakage. Possible the diaphragm relaxed so lung pressure increases due to rib cage closing in, so the lung cannot be expanded. Aka shortness of breath.


e) in order to know/detect exercise is to see the tidal volume (breath in and out in one cycle) increasing to show rapid breaths for oxygen supply to meet oxygen demand.

If you struggle with these type of questions i suggest watching short videos with a graph next to it, to show the person breathing in and out, with labelled terms eg. vital capacity.

I hope that helps : )

Oh ok great, I will look at them thanks. Your explanation for e) is written coherently with the right terms , however I do suggest adding some useful terms since the questions points in reference to the graph, you want to probs mention the trace will have a higher frequency and amplitude since the tidal volume is rapidly increasing. The vital capacity also remains the same (because that's the maximum amount of air that can leave the lungs after breathing in as much as possible) . so pls include parts of the graph to help you remain in the specificity of the question, as it states 'what ways would you expect the trace to change'

Aside from that, great job explaining the effects of the exercise on the body.