human gas exchange

Question 1

In calculating the magnification, what assumption did you have to make about how the section was cut

Answer 1

Idea of cut through maximum diameter / middle;

Question 2

Cells A and B are biconcave discs. Explain one advantage of a biconcave disc over a spherical cell of the same volume in transporting oxygen.

Answer 2

Large (surface) area;
For diffusion;
or
Short distance to centre of cell / to all haemoglobin;
For diffusion;