We have discussed changes in flow (blood or gases) due to changes in the

diameter of different tubes (blood vessels or bronchioles). Explain the relationship

between flow, tube diameter, and resistance as the tube diameter increases or

decreases, by filling in the statements below with the terms 'increases' or 'decreases'. [If you are worried about pressure, assume that it does not change.]

A. As tube diameter decreases, resistance __________________, and thus flow ________________.

B. As tube diameter increases, resistance ___________________, and thus flow _________________.