Advertisements
Advertisements
प्रश्न
How are the lungs designed in human beings to maximize the area for exchange of gases?
Advertisements
उत्तर १
Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli. The oxygen from the breath, diffuses into the blood and CO2 from the blood brought from the body, diffuses out into the air.
उत्तर २
- Human lungs contain a highly branched system of respiratory tubes. A primary bronchus splits into secondary bronchi, which then form tertiary bronchi. Each tertiary bronchus further divides into bronchioles that end in alveoli. Alveoli are small, rounded, thin-walled pouches with a network of capillaries.
- Gas exchange occurs in the alveoli, which is why each alveolus is considered a miniature lung. The alveoli offer a large surface area for gas exchange. Oxygen diffuses from the alveoli into the pulmonary capillaries, while carbon dioxide diffuses from the capillaries into the alveoli. The total surface area of the alveoli in human lungs is estimated to be about 100 m².
APPEARS IN
संबंधित प्रश्न
Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
List the differences between aerobic and anaerobic respiration.
Mention any two components of blood.
During respiration, the plants take CO2 and release O2.
Fill in the Following Blank with Suitable Word.
_________ In the Lungs Provide a Very Large Surface Area for Gaseous Exchange.
What is meant by aquatic animals and terrestrial animals?
A, B and C are three living organisms. The organism A is a unicellullar fungus which can live without air. It is used in the commercial production of an organic compound P from molasses. The organism B is a unicellular animal which lives in water and feeds and moves by using pseudopodia. It breathes through an organelle Q. The organism C is a tiny animal which acts as a carrier of malarial parasite. It breathes and respires through a kind of tiny holes R and air-tubes S in its body.
(a) What are organisms (i) A (ii) B, and (iii) C?
(b) Name (i) P (ii) Q (iii) R, and (iv) S.
(c) Which organism/organisms undergo aerobic respiration?
(d) Which organism/organisms undergo anaerobic respiration?
Out of xylem and phloem, which one carries materials upwards as well as downwards?
It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon?
Answer the following in detail.
How is the process of cellular respiration different from breathing?
Choose the odd one out in the following groups of four items each:
Ethyl alcohol, Carbon dioxide, Starch, Oxygen
Choose the odd one out in the following groups of four items each:
Diffusion, Respiratory gases, Alveoli, Capillary network
Rewrite the following statement by selecting the correct option.
During respiration, ____________ gas is given out.
____________ is the maximum amount of air that the lungs can hold after a maximum forceful inspiration.
How much percent of C02 is transported in a dissolved form as carbonic acid?
Name the substances whose build-up in the muscles during vigorous physical exercise may cause cramps?
Which is the correct sequence of air passage during inhalation?
List the similarities between aerobic and anaerobic respiration.
Visit a doctor. Find out about artificial respiration. Ask the doctor:
- When does a person need artificial respiration?
- Does the person need to be kept on artificial respiration temporarily or permanently?
- From where can the person get supply of oxygen for artificial respiration?
