Inside
the lungs, the bronchi are divided into…
a) alveoli
b) larynx
c) bronchioles
d)
oesophagus
Bronchioles
end at tiny thin walled air sacs called…….
a) alveoli
b) larynx
c) nephrons
d) villi
Explanation:tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
In which
part of the following, the gaseous exchange takes place?
a) alveoli
b) larynx
c)
bronchi
d) villi
Exchange of
gases takes place inside lungs at alveoli between air and ……..
a) food
b) plasma
c) blood
d) urine
Explanation:During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Which of the following is like huge spongy organ as it is contains millions of alveoli?
a) brain
b) stomach
c) kidney
d) lung
Explanation:The lungs are the primary organs of the respiratory system in humans and most other animals, including some snails and a small number of fish. In mammals and most other vertebrates, two lungs are located near the backbone on either side of the heart. Their function in the respiratory system is to extract oxygen from the air and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere, in a process of gas exchange.
How many
alveoli are present in each lung?
a) hundreds
b)
thousands
c) millions
d) billions
Explanation:There are about 300 million alveoli in both the lungs which increase the surface area for the exchange of respiratory gases.
