Tag: gas exchange and smoking

Questions Related to gas exchange and smoking

Where does exchange of gases ($O _2$ and $CO _2$) take place in our lungs?

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Pleura

  2. Bronchi

  3. Alveoli

  4. Trachea

Show answer
Correct Option: C
Explanation:

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other. This barrier between air and blood averages about 1 micron  in thickness. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

So the correct option is 'alveoli'.

Read the given statements and choose correct answer :-
(i) Initial bronchioles are supported by incomplete cartilagenous rings.
(ii) In human lungs are solid and spongy.
(iii) Alveoli wall contains simple squamous epithelium and white fibrous connective tissue (iv) Lungs are covered by a single layered pleura

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Three statements are correct

  2. Three statements are incorrect

  3. Only two statements are correct

  4. None of them

Show answer
Correct Option: A
Explanation:
The lungs are the primary organs of the respiratory system in humans and
they are covered by a double layered pleura. They are a part of the lower respiratory tract that begins at the trachea and branches into the bronchi and bronchioles. In the main bronchi, hyaline cartilage forms an incomplete ring, giving a "D"-shaped appearance.  The respiratory or gas-exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous epithelium and white fibrous connective tissue. The lungs feel spongy because of the presence of millions of alveoli inside them. So, i, ii and iii statements are correct. 
So, the correct option is 'Three statements are correct'.

The area of inner surface of bronchiole is 

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. $1m^2$

  2. $10m^2$

  3. $100m^2$

  4. $1000m^2$

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Correct Option: B

Which of the following structures is NOT supported by incomplete cartilaginous rings?

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Trachea

  2. Secondary bronchi

  3. Terminal bronchioles

  4. Primary bronchi

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Correct Option: A

Respiratory structures in insects are called as

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Gills

  2. Skin

  3. Lungs

  4. Trachea

Show answer
Correct Option: D
Explanation:

Trachea is a respiratory organ of insects. It is made up of a system of branching tubes that deliver oxygen to the tissues and remove carbon dioxide from the tissues.

The narrowest and most numerous tubes of lungs are called as

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Bronchi

  2. Alveoli

  3. Bronchioles

  4. Tertiary bronchi

Show answer
Correct Option: C
Explanation:

The lungs which form the main respiratory system is a pair of spongy, air-filled organs which is located on either side of the chest in the rib cage. The inhaled air passes through the trachea (windpipe) into the lungs through its tubular branches known as bronchi which further divide into numerous smaller tubes known as the bronchioles. 

Which of the following process is responsible for the release of carbon dioxide by the animals?

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Respiration

  2. Digestion

  3. Photosynthesis

  4. Reproduction

Show answer
Correct Option: A
Explanation:

  • During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. 
  • Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration. Hence, respiration is responsible for the release of carbon dioxide by animals.
So, the correct answer is 'respiration'.

By observing the interdependence of plants and animals and circulation of oxygen and carbon dioxide we can say that

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Some day all the oxygen will be used up by the animals.

  2. Some day all the carbon dioxide will be used up by the plants.

  3. The amount of oxygen is increasing and that of carbon dioxide is decreasing in our atmosphere.

  4. The level of oxygen and carbon dioxide in the atmosphere is kept constant.

Show answer
Correct Option: D
Explanation:

  • The free oxygen in the atmosphere comes from photosynthesis by green plants, chiefly the phytoplankton in the ocean.
  •  Animals and combustion of organic matter absorb the oxygen and release CO2.
  • This Carbon dioxide is absorbed by green plants which are exhaled by animals.
  •  It’s a dynamic equilibrium. Hence, By observing the interdependence of plants and animals and circulation of oxygen and carbon dioxide we can say that The level of oxygen and carbon dioxide in the atmosphere is kept constant.
So, the correct answer is 'The level of oxygen and carbon dioxide in the atmosphere is kept constant'.

Plants and animals help in maintaining the balance of

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Trees and animals

  2. Oxygen and carbon dioxide

  3. Green plants and plant eaters

  4. Water and minerals

Show answer
Correct Option: B
Explanation:

  • All plants and animals on earth engage in a process called respiration.
  • Respiration combines oxygen and the food created during photosynthesis to produce usable energy. 
  • One of the byproducts of respiration is CO2,  if plants stop to take up CO2 and stop releasing O2, then plants will stop to convert sunlight into carbohydrates, and die.
  • The death of autotrophs would lead to a chain reaction to the death of all higher-order organisms, Hence, Plants and animals help in maintaining the balance of Oxygen and carbon dioxide. 
So, the correct answer is 'Oxygen and carbon dioxide'.

Which of the following might happen if plants stop releasing oxygen into the atmosphere?

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Plants will be healthier

  2. Number of plants will increase

  3. Number of animals will increase

  4. Animals will die from the lack of oxygen

Show answer
Correct Option: D
Explanation:

  • All plants and animals on earth engage in a process called respiration.
  • Respiration combines oxygen and the food created during photosynthesis to produce usable energy. 
  • One of the byproducts of respiration is CO2,  if plants stop to take up CO2 and stop releasing O2, then plants will stop to convert sunlight into carbohydrates, and die.
  •  The death of autotrophs would lead to a chain reaction to the death of all higher-order organisms. Hence, Animals will die from the lack of oxygen if plants stop releasing oxygen into the atmosphere.
So, the correct answer is 'Animals will die from the lack of oxygen'.