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.
They are brightly colored, with a blue upper body, red breast, and white belly. Males have wing and tail feathers that are blue with black or gray shafts and tips. Females look similar to males, but are usually duller in color and are slightly larger. Adult eastern bluebirds weigh 27 to 34 grams. They are about 18 cm long from the tip of their beak to the end of their tail. Young bluebirds are grayish in color. They have speckled breasts and their wings have blue tips.