Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

13 Cards in this Set

  • Front
  • Back
Precentages of Gases in the Air
Oxygen -21%
Nitrogen -79%
CO2 -.03%
What is respiration?
the exchange of O2 and CO2 between the cell and the environment.
Partial Pressures
The Partial Pressure gradient moves gases. Moves from high to low. PO2 in lung=~105, tissues=~40. O2 moves from lungs to tissues.
Factors that influence how much gas enters a liquid...
1)nature of the gas - solubility
2)temo - more gas stays in cooler liquid
3)nature -solid/liquid/gas
5)solutes - solutes push gas out of liquid
6)resp. pigments
What is 'bends'?
when scuba diving and come up to fast the pressure changes too fast and nitrogen bubbles out of your blood.
Which is a better respiratory medium..air or liquid?
AIR -- diffusion is 10,000 times faster and less energy is required to move air. more oxygen per liter of air
What could cause a fish die-off?
If the water temp increased then the oxygen would diffuse out and the fish would not have enough oxygen to survive.
What is the problem with a spherical organism?
sphere has less SA for diffusion. has to be the size of a pin-head b/c a larger radius requires a larger PO2
Diffusion is proportional to distance squared
How do we get oxygen from outside of body to inside and obtain enough O2?
circ. system, lungs/gills, and a tracheal system, resp. pigments, large organism must be flat
why is respiration so important?
We need O2 to get rid of CO2 so we can make ATP
major byproduct of Krebs cycle
O2 and respiration
O2 is the final electron acceptor in the electron tansport chain