Atmosphere Flashcards
Oxygen combined in our … stream with nutrients from food to provide …. for life
Blood, Energy
…. senses level of waste CO2 and send a message to our … that controls the amount of breathing required to draw more … inside
The lung, Brain, Oxygen
What is Atmospheric Pressure?
Pressure exerted by column of air
Air consists of … % oxygen, …% nitrogen
21, 78
The standard atmospheric pressure @sea level is … mb
1013
As you increase in altitude, there is more/less oxygen available
Less
The normal partial pressure of oxygen outside the lungs that is breathed in is …. mmHg
150
Due to the presence of …. and …. , the partial pressure of oxygen outside the lungs …. once breathed into the lungs to 102 mmHg
Water Vapor, CO2, Reduces
The minimum pressure that oxygen must be inside the lungs is …. mmHg or the same as at the altitude of ….. feet
102, 10000
The atmospheric pressure …. with an increase in altitude
Decreases
At sea level, oxygen makes 21% of the atmosphere. At 10,000 ft, oxygen makes …. % of the atmosphere
21
At 18,000 ft, partial pressure of oxygen is …. of that at sea level.
At 34,000 ft, partial pressure of oxygen is … of that at sea level.
1/2, 1/4
As we increase in altitude, it is harder for the oxygen molecules to cross the alveolar membrane and get into the bloodstream. Why?
Atmospheric pressure decreases -> Partial pressure of oxygen decreases -> less pressure gradient between lungs and bloodstream
The …. is the transport within the bloodstream
Haemoglobin Molecule
… gas transported through the …. from the heart to body cells
Oxygen, Arteries
