Exchange

Question 1

Respiratory gases

Answer 1

oxygen

carbon dioxide

Question 2

Nutrients

Answer 2

glucose
fatty acids
amino acids
vitamins and mineral

Question 3

Excretory products

Answer 3

urea
carbon dioxide
heat

Question 4

Gas Exchage happne where?

Answer 4

acoss the surface of an organism

Question 5

where are the materials used?

Answer 5

the entire volume

Question 6

how does surface area increase?

Answer 6

in square numbers

Question 7

how does volume increase?

Answer 7

in cube numbers

Question 8

what increases quicker square number or cube numbers?

Answer 8

cube

Question 9

how does surface area to volume ratio change?

Answer 9

decreases

gets smaller

Question 10

SA:V ratio

Answer 10

a meaure of the SA relative to the overall Volume

Question 11

Higher the SA:V ratio value

Answer 11

less need for a specialised exchange exchange system

Question 12

small SA:V ratio

Answer 12

bigger rounder organisms

Question 13

Fick’s Law

Answer 13

rate of diffusion = (surface area X concentration gradient) / membrane thickness

Question 14

how to increase rate of diffusion?

Answer 14

large SA
large concentrations gradient
small membrane thickness

Question 15

Gas exchange surface adaptations

Answer 15

large SA:V ratio
short diffusion pathway
partially permeable membrane
maintains diffusion gradient

Question 16

Large Surface Area

Answer 16

increaes rate of exchange by folding of the exchange surface

Question 17

Permeable Membrane

Answer 17

allows liquids and gases to pass through

Question 18

Short Diffusion Pathway

Answer 18

diffusion distance is short and therefore materials cross rapidly

Question 19

Movement of environmental medium

Answer 19

maintains a diffusion gradient

Question 20

Internal Transport System

Answer 20

ensure movement of internal medium (blood to maintain diffusion gradient)