Question

Pneumatic Bones of birds_________

A. increase the respiratory rate

B. increase the Heartbeat rate

C. trees the $CO_2$ output

D. increase the buoyancy

Answer 1

Some of the birds have very efficient and increased respiratory rates. This distinguished characteristic is due to the presence of some specialized function performed by the skeletal system.

Complete answer:

- ‘Pneumatic’ is related to ‘breathing’. The presence of Pneumatic bones in birds has made their process of breathing very peculiar. Pneumatic bones are hollow from inside. These pneumatic bones contain air sacs in them due to which the availability of air in bones of birds is higher.

- These pneumatic bones provide efficiency to the bird's respiratory system. The presence of air sacs and cavities help in the reduction of weight of birds. As the weight reduces, the ability of birds to fly increases. Air sacs along with increasing respiratory rate also help in the regulation of temperature of the body as they act as cooling systems.

- The hollowness of bones make the skeleton light in weight and non flexible. The respiratory system of birds is also efficient because it makes most of the volume of the bird and it is comparatively larger to help the bird Take easy flight.

- Another way which birds used to reduce their weight also includes their ability to maintain a small structure of their reproductive organs which are generally increased in size during the season of breeding. This helps the birds to adapt better to the flights. The density of bones also helps in maintaining suitable water buoyancy.

The correct answer is (A).

Note: The extent of pneumatization in all the birds is not the same. The pneumatic bones in large birds are more capacious than those in small birds like sea Birds.