Surface area is a principle concept related to many areas in biological functioning. Heat as well as substances can be transferred between and within the body and the environment. Explain the relationship between surface area and this transfer. (25 marks)
Hint: Think of everything you know about the topic e.g.
- Al cells, tissues and organs that have surface areas linked to their function e.g. skin, lungs, intestinal tract, red blood cells
- How each example is structured to produce a large surface area
- The role of each of the examples in the body
- What substances are involved in these examples e.g. heat, gases, nutrients
- State clearly whether there an internal and/or an external transfer of substances
