The function of the respiratory system is to deliver air to the lungs. Oxygen in the air diffuses out of the lungs and into the blood, while carbon dioxide diffuses in the opposite direction, out of the blood and into the lungs.Respiration includes the following processes: Pulmonary ventilation is the process of breathingâinspiration (inhaling air) and expiration (exhaling air).xternal respiration is the exchange if oxygen and carbon dioxide between the blood and air in the lungs, and internal resparation is the exchange of gases between blood cells of the body.
Boxes can be painted or stained with a light color on the outside and left natural on the inside. Birdhouses for Eastern Bluebirds should be approximately 4 x 4 inches to 5 x 5 inches with entry holes that are either 1 inch round holes, 1 3/8 x 2 vertical oval holes or 1 1/8 inch horizontal slot entrances.
In the case of most. cavity nesters, one egg is laid one each day until the entire clutch is complete. Incubation will then begin. For bluebirds, incubation typically lasts approximately 12â14 days. After hatching, the chicks will remain in the nest for about 17â21. days. Your monitoring should be limited to viewing from a distance after the 12â13th day, or the chicks might jump or fly. from the box prematurely.