(a(i))[2]
Using the information in Fig. 1.1, explain why the overall movement of oxygen molecules is from outside the cell to inside the cell.
(a(ii))[1]
State the source of the energy used in diffusion.
(b(i))[1]
State the name of the cells that carry oxygen in the human body.
(b(ii))[1]
State the name of the molecule to which oxygen binds during transport around the body.
(c)[3]
Complete Table 1.1 by indicating for each factor whether it increases the rate of diffusion of oxygen molecules, decreases it, or makes no difference.
(d)[3]
Some molecules are moved by active transport instead of diffusion. Describe what is meant by the term active transport.