Exchange Surfaces Flashcards
1
Q
During inspiration, do the internal intercostal muscles contract or relax?
A
contract, pulling the ribcage upwards and outwards
2
Q
Describe and explain how one feature of the LUNGS provides an efficient gas exchange surface
A
large surface area for diffusion
or
epithelial cells/alveolar wall only one cell thick for a short diffusion distance
or
good blood supply/ventilation for maintaining a steep concentration gradient
3
Q
What is the residual volume?
A
the volume of air that always remains in the lungs so they don’t collapse
4
Q
State one feature of alveoli that provides an efficient gas exchange surface
A
- They only have a single layer of epithelium cells
- close to make capillaries
- many so large surface area
5
Q
What is the role of smooth muscle in the walls of the bronchioles?
A
contracts to close bronchiole or relaxes to open bronchiole
