The exchange of gases (O2 & CO2) between the alveoli & the blood occurs by simple diffusion: O2 diffusing from the alveoli into the blood & CO2 from the blood into the alveoli. Diffusion requires a concentration gradient. in the alveoli must be kept at a lower lever than in the blood. We do this, of course, by breathing - continuously bringing fresh air (with lots of O2& little CO2) into the lungs & the alveoli. Breathing is an active process - requiring the contraction of skeletal muscles.
Quick Answer. During a rooster injection on a knee, the doctor cleans an injection site near the kneecap, inserts a needle and withdraws any extra fluid from the knee area, and then through the same needle injects a solution containing hyaluronic acid, a substance obtained from rooster combs, into the knee joint, according to WebMD.
Rooster Sheave Assembly. The rooster sheave is a pin-on rigging accessory with a composite sheave identical to the boom tip sheaves. It is required if rigging is more than six parts of line, or when an auxiliary winch is used. A second ATB transmitter can easily be bolted to it when used with an auxiliary winch. It is a complete install kit with easily removable pins. Auxiliary Winch Option with Rooster Sheave. This option gives the operator a second winch to operate as a tag line. The second winch is a 12000 lb single speed unity, mounted directly behind the main winch. A down haul bail is included.