Respiratory System, part 1: Crash Course AOP #31
1. From the very beginning, the earliest, simplest forms of life, like bacteria, extracted
they needed right from the water through their membranes, and they did it
through simple
2. What is the key to efficient diffusion of any material? DA N
3. Bulk flow is like public transportation, it moves targe numbers of
MAR
quickly.
4. The upper parts that funnel the air in, make up what's known as the
VAN
zone.
5. Now we are in the lung tissue and have entered what we call the
zone. This is where the actual gas exchange occurs, and everything you find here has a form to suit
that function.
6. Both of your lungs contain about seven hundred million alveoli, which together provide an amazing
square meters of moist membrane surface area.
7. REVIEW:
The principles that make respiration possible are relatively simple, diffusion and
flow,
and so are the mechanisms in your body that use them. It just took us about four hundred million
years to figure out how to make it all work, but today you learned how it does work, including the
mechanics of both simple diffusion and bulk flow, and the physiology of breathing, and the anatomy
of the conducting zone and the respiratory zone of your
system.
Respiratory System, part 2: Crash Course AGP #32