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.
Cut the top piece of the nest box, 11 1/4 x 11. Cut the two side pieces. They should be 6 1/2 across; the rear edge should be 12 1/4 top to bottom, and the front edge, 10 3/4. Drill 5/8 vent holes 1 down from the top and 2 in from each side. Toward the top of the front edge, and 3/8 in, drill a 1/8 hole for a nail or a screw. Cut the front of the box, 5 wide and 10 3/4 long, with an entrance hole (a 1 1/2 hole for eastern bluebirds or western bluebirds, and 1 9/16 hole where ranges for the two overlap with mountain bluebirds) whose center is 2 from the top and 2 1/2 from each side.