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प्रश्न
How are the alveoli designed to maximise the exchange of gases?
उत्तर
The terminal of the bronchioles contains the alveoli. These are structures that resemble balloons and are densely packed with blood arteries. Their thin membranes enhance the surface area available for gas exchange.
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संबंधित प्रश्न
Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction − upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.
- The air tubes of insects
- Skeletal structures surrounding chest cavity
- Muscular floor of chest cavity
- Tiny pores on the surface of leaf
- Small openings on the sides of the body of an insect
- The respiratory organs of human beings
- The openings through which we inhale
- An anaerobic organism
- An organism with tracheal system
What is the name of the extensions of the epidermal cells of a root which help in respiration?
Where does the blood absorb oxygen in the human body?
Fill in the following blank with suitable word:
The organs of respiration in man are the _____________.
Fill in the Following Blank with Suitable Word.
_________ In the Lungs Provide a Very Large Surface Area for Gaseous Exchange.
Explain why, a land plant may die if its roots remain waterlogged for a long time.
Name the type of respiration in which the end product is:
Lactic acid
Give one example where such a respiration can occur.
Describe the process of respiration in Amoeba. State whether it is anaerobic respiration or aerobic respiration.
Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?
Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
During respiration, the exchange of gases takes place in:
Which of the following statements are correct?
(i) pyruvate can be converted into ethanol and carbon dioxide by yeast
(ii) fermentation takes place in the case of aerobic bacteria
(iii) fermentation takes place in mitochondria
(iv) fermentation is a form of anaerobic respiration
The photosynthesis in a plant is not taking place during the day time if the plant is releasing:
There are five animals P, Q, R, S and T. The animal P always lives in water and has gills for breathing. The animal Q can stay in water as well as on land and can breathe both, through moist skin and lungs. The animal R lives in soil and breathes only through its skin. The animal S lives on land and breathes through spiracles and tracheae. And animal T lives in water and breathes through its cell membrane.
(a) Which of the animals could be Amoeba?
(b) Which of the animals could be frog?
(c) Which animal could be fish?
(d) Which animal could be grasshopper?
(e) Which animal could be earthworm?
Consider the following chemical reactions which take place in different organisms/tissues under various conditions:
(i) Glucose → Respiration ">Ethanol + Carbon dioxide + Energy
(ii) Glucose→ Respiration ">Carbon dioxide + Water + Energy
(iii) Glucose → Respiration "> Lactic acid + Energy
(a) Name one organism which respires according to equation (i) above.
(b) Name one organism which respires according to equation (ii) above.
(c) When and where does respiration represented by equation (iii) above take place?
(d) Which equation/equations represent aerobic respiration?
(e) Which equation/equations represent anaerobic respiration?
(f) Which of the above reactions produces the maximum amount of energy?
An organism X having breathing organs A lives on land. When organism X goes underwater, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of the water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes, and rivers can survive on land as well as in water equally well.
(a) What could organism X be? Name the breathing organs A.
(b) What could organism Y be? Name the breathing organs B.
(c) What could organism Z be? Name the breathing organs C and D.
(d) Out of X, Y, and Z, which organism is (i) amphibian, (ii) aquatic, and (iii)
terrestrial?
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?
Veins and arteries carry blood. Which of these carry blood back to the heart?
Answer this question.
Name the organ of respiration in fishes.
Tick the most appropriate answer.
The products of respiration are :
Choose the odd one out in the following groups of four items each:
Diffusion, Respiratory gases, Alveoli, Capillary network
Choose the odd one out in each of the following groups of four items each:
Oxyhaemoglobin, Carbaminohaemoglobin, Hypoxia, Carboxyhaemoglobin
Name the body structure concerned with the given functional activity:
Combines with the oxygen in the lungs.
What is the normal percentage composition of gases in inspired and expired air respectively?
Given below is an example of certain structure and its special functional activity:
"Kidney and excretion".
Fill in the blanks on a similar pattern.
Diaphragm and _____________.
State one function of the following:
Diaphragm
With regard to the respiratory system and the process of respiration in man, answer the following question:
What is meant by :
- Residual air and
- Dead air space
Rewrite the following statement by selecting the correct option.
During respiration, ____________ gas is given out.
Answer the following question.
In the experimental set up to show that "CO2 is given out during respiration", name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.
Define respiration.
Name the organs that bring about respiration.
Air that enters through the nose passes into this tube.
Complete the analogy.
Transport of CO2 by plasma : 7% :: Transport of CO2 by bicarbonate ions: ____________.
What is the ppCO2 in alveolar air?
____________ is necessary for the respiration in plant.
What is common between extensive network of blood vessels around walls of alveoli and in glomerulus of nephron?
Yeast is used in wine and beer industries because it respires
Visit a local doctor. Learn about the harmful effects of smoking. You can also collect material on this topic from other sources. You can seek help of your teacher or parents. Find out the percentage of people of your area who smoke. If you have a smoker in your family, confront him with the material that you have collected.
