Gas exchange in animals Flashcards
1
Q
What is the composition of air?
A
21% Oxygen, 78% Nitrogen
2
Q
What does partial pressure do?
A
Driving force for diffusion
3
Q
What are the 3 forms of passive transport?
A
Simple: molecules move from are of high concentration to an area of low concentration
Facilitated: same but uses transport proteins
4
Q
What does the rate of diffusion depend on?
A
- Partial pressure
- Temperature
- Membrane properties
5
Q
What do parapodia do?
A
Assist in gas exchange in marine annelids
6
Q
What are some disadvantages to external gills?
A
Damage, Energy costs, Predator attention
7
Q
What are the 2 methods of internal gill ventilation?
A
- Buccal pumping
2. Ram ventilation
8
Q
Does blood entering or leaving gills have higher oxygen partial pressure?
A
Leaving
9
Q
How does CO2 get transported?
A
In plasma solution, or haemoglobin in erythrocytes.
