Surface Area : Volume

Question 1

What does having a large sa:v mean?

Answer 1

•Having a big surface area
•Shorter distance from the centre (simple diffusion therefore meets their exchange needs)

Question 2

What does having a small sa:v mean?

Answer 2

•A higher metabolic rate
•A larger distance from the outside to the centre of the organism

Question 3

How do you calculate sa:v?

Answer 3

Sa/v:1

Question 4

Name three features of a key gas exchange system?

Answer 4

Large surface area
Thin/short distance
Steep concentration gradient maintained by blood supply or ventilation

Question 5

How do you calculate the surface area of a sphere?

Answer 5

A=4πr2

Question 6

How do you calculate the volume of a sphere?

Answer 6

V=4/3πr3

Question 7

What is rate of diffusion affected by?

Answer 7

Surface area
Concentration gradient
Length of diffusion pathway

Question 8

What does metabolic rate measure?

Answer 8

The amount of energy your body needs in order to maintain homeostasis

Question 9

What does homeostasis mean?

Answer 9

the tendency of an organism to maintain a stable internal state
(Equilibrium)