Surface exchange + Sa:V

Question 1

Describe the relationship between the size of an organism or structure and its surface area to volume ratio

Answer 1

The bigger the organism, the smaller the SA:V ratio

Question 2

Describe how larger organisms increase their surface area to volume ratio

Answer 2

By having mass transport system such as the lungs

Question 3

Features of an exchange surface

Answer 3

Large SA:V ratio to increase rate
Very thin, short pathway
Selectively permeable membrane
Movement of environmental medium
Transport system to ensure movement of internal medium