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प्रश्न
What is the name of tiny air-sacs at the end of smallest bronchioles in the lungs?
उत्तर
Alveoli are the tiny air-sacs at the end of smallest bronchioles in the lungs.
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संबंधित प्रश्न
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
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The photosynthesis in a plant is not taking place during the day time if the plant is releasing:
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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?
An animal in which the oxygenation of blood does not take place in the lungs is:
Tick the most appropriate answer.
The products of respiration are :
Name the body structure concerned with the given functional activity:
Transports oxygen to the body cells.
Name the body structure concerned with the given functional activity:
Provides actual diffusion of respiratory gases in the lungs.
Match the items in Column I with the ones most appropriate in Column II. Rewrite the matching pairs.
|
Column I |
Column II |
|
(a) Alveoli |
(i) where aerobic respiration takes place |
|
(b) Bronchioles |
(ii) lined with hair |
|
(c) Nasal Chamber |
(iii) diffusion of gases |
|
(d) Bronchi |
(iv) small air tubes |
|
(v) an inverted Y shaped tube |
|
|
(vi) a common passage for food and air |
Give suitable explanation for the following :
Why does a person feel breathlessness at higher altitudes?
Draw a diagram of the human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it.
Which of the following statement(s) is (are) true about respiration?
- During inhalation, ribs move inward and the diaphragm is raised
- In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air
- Haemoglobin has a greater affinity for carbon dioxide than oxygen
- Alveoli increase surface area for the exchange of gases
