Exchange Surfaces & Breathing Flashcards
Why is diffusion enough for single celled organisms
Metabolic activity of a single-celled organism is usually low, therefore O2 demands & CO2 production of the cell are low
The SA:V ratio of the organism is large
Features of specialised exchange surfaces
Structures of mammalian gaseous exchange surfaces
- Nasal Cavity
- Trachea
- Bronchus
- Bronchioles
- Aleveoli
Functions / characteristics of nasal cavity
Functions / characteristics of the trachea
Functions / characteristics of bronchus
Functions / characteristics of bronchioles
Functions / characteristics of Alveoli
Exchange surfaces specialised tissue?
What is ventilation of the lungs
How air is moved in & out as a result of pressure changes in the thorax (chest cavity)
What’s inspiration & what occurs during it
What is expiration & what occurs during it
Ventilation rate =
Tidal volume x breathing rate
Breathing rate =
Number of breaths taken in 1 minute
One breath = air in & out
What’s oxygen uptake
The volume of oxygen used up by someone in a given time
What’s vital capacity
The max volume of air that can be breathed in or out in one breath
What’s tidal volume
The volume of air that is breathed out or in during normal breathing
At rest
How do we find these diff breathing measurements
Using a spirometer
How is a spirometer used
To find diff breathing measurements
You breathe in & out through air
->.CO2 is absorbed from the exhaled air by soda lime, to limit the CO2 conc as if it’s too high = respiratory distress
Diagram of breathing graph
Normal expiration vs forced expiration
