Chapter 11- Lung Flashcards
What happens to the volume and pressure when you exhale?
Plural cavity volume increases and pressure increases
What happens to volume and pressure when you inhale?
Volume in plural cavity decreases and plural cavity pressure goes down
What are the three functions of the respiratory system?
Capture oxygen
Defend against invasion of airborn micro organisms
Produce sounds that make speech possible
What does the respiratory surface require?
A thin surface for diffusion
A moist surface for O2 and CO2 to be in a solution
Contact with oxygen
Contact with the transport system
Can diffusion alone support the tissues and organs?
No
What is the pharynx?
Throat
What is the larynx?
Voice box
What is the trachea?
Windpipe
What does the contraction of the diaphragm mean? (Being pulled down)
Means we’re inhaling
What does the relaxation of respiratory muscles mean?
Means we’re exhaling
Where does the exchange of gases take place?
The alveolar surface (bronchi-bronchioles-thin air sacs called alveoli)
What is external respiration?
Exchange of gases across alveolar capillary surface
What does oxygen do while it moves from alveoli to capillaries?
Moves down its concentration gradient
What is equilibrium?
It means changing NOT equal
In capillaries where does oxygen diffuse to and binds to what
Oxygen diffuses into RBC’s and binds to hemoglobin producing oxygenated blood
