Exchange and Transport Mechanisms

Question 1

Surface area to volume ratio in exchange

Answer 1

SA must be large in comparison to volume for efficient exchange because it ensures quick exchange

Question 2

What is diffusion?

Answer 2

The movement of particles from an area of high concentration to an area of low concentration e.g. in the lungs

Question 3

What is facilitated diffusion?

Answer 3

A type of passive transport allows molecules to move across a cell membrane along their concentration gradient with the assistance of specializes proteins

Question 4

What is osmosis?

Answer 4

The passage of water or other solvents through a semipermeable membrane e.g. diabetes

Question 5

What is active transport?

Answer 5

When cells move molecules across their membrane from an area of low to high concentration using energy

Question 6

What is co-transport?

Answer 6

The coupled movement of two substances across a membrane

Question 7

What is the effect of diffusion on rate of exchange?

Answer 7

If the distance is smaller diffusion will happen faster as the particles don’t travel far

Question 8

How will temperature on rate of exchange?

Answer 8

It will increase the rate as they will have more energy and move faster

Question 9

What does metabolic rate mean?

Answer 9

The amount of energy your body uses to maintain normal necessary actions e.g. breathing, circulation

Question 10

How does the metabolic rate effect the rate of exchange?

Answer 10

Higher the metabolic rate the more energy there is increasing the rate of diffusion

Question 11

What is the fluid mosaic model?

Answer 11

A model that describes the arrangement and movement of the molecules that make up a cell membrane

Question 12

What is passive transport?

Answer 12

The movement of substances across a cell without eh use of energy by the cell