HARD
AS and A Level
IMPORTANT
Earn 100
Describe in detail that can be seen in a TEM of a ciliated epithelial cell that cannot be seen under high power with a light microscope.
Important Questions on Gas Exchange
HARD
AS and A Level
IMPORTANT
Describe the pathway taken by a molecule of oxygen as it passes from the atmosphere to the lungs.
HARD
AS and A Level
IMPORTANT
Explain how alveoli are adapted for gas exchange.
HARD
AS and A Level
IMPORTANT
Explain the advantage of being able to adjust the diameter of bronchioles.
HARD
AS and A Level
IMPORTANT
How many times does an oxygen molecule cross a cell surface membrane as it moves from the air into a red blood cell, Explain your answer.
HARD
AS and A Level
IMPORTANT
The electron microscope was needed to confirm that each alveolus is completely surrounnded by epithelial cells. Explain why?
HARD
AS and A Level
IMPORTANT
Draw the low power plan diagram of trachea.
HARD
AS and A Level
IMPORTANT
Draw the low power plan diagram of bronchus.
HARD
AS and A Level
IMPORTANT
The following structures are found in the walls of the gas exchange system.
1 Cilia
2 Elastic fibres
3 Smooth muscle cells
4 Goblet cells
5 Squamous epithelial cells.
Which would be found in the lining of an alveolus.
