Gaseous exchange Flashcards
1
Q
Alveoli
A
Cells secrete surfactant to maintain SA
2
Q
Jar question
A
Volume of air in jar increases
Air forced into the balloons due to the pressure in the jar being below atmospheric pressure
3
Q
Tidal volume
A
Volume of air inhaled/exhaled in one breath during regular breathing
4
Q
Vital Capacity
A
Volume of breath after maximum inhalation/exhalation
5
Q
Plants
A
Have a small SA:V and need a specialised SA for gaseous exchange
6
Q
Cube
A
Divide length by time taken
- uses whole length of a side rather than half a length
7
Q
Good ventilation
A
Supplies O2 to the alveoli and removes CO2
8
Q
Expiration
A
- External intercostal muscles relax
- Diaphragm relax
- Ribs move in and up
- Pressure in thorax decreases to below atmospheric pressure and air leaves down the pressure gradient
