biologi

3. Balancing energy needs
Energy intake is the energy that we get
in our food in a day.
Energy output is the energy that our
body use in a day.
If the energy intake is greater than
energy output, then fat is stored in the
body mass increase and it can becoming
overweight or even obese.

8. The Stomach and Small Intestine
The stomach is a muscular bag that
usually hold about 1 litre of food but can
stretch to accommodate more.
The small intestine is not really so small
as it is about 6 metres long; however its
diameter is less than that of the large
intestine.