$2$ Figure $2\mathrm{.}1$ illustrates a cube for calculating the surface area to volume ratio.

Fig$\mathrm{.}2\mathrm{.}1$

$($a$)$ Calculate $(1)$ the surface area, $(2)$ the volume, and $(3)$ the surface to volume ratio for the following four cubes.

SA for cube:

V for cube: $-$

SA$/$V ratio:

$[1]$

$($b$)$ What will happen to the surface area to volume ratio if the size of cell $\text{'}$ A $\text{'}$ is increased?

$3$ Fig $3\mathrm{.}1$ illustrates the cardiac cycle.

$($a$)$ What happens in the heart chambers during systole and diastole?

$$