Tag: gas exchange in humans

Questions Related to gas exchange in humans

Lungs have a large number of narrow tubes called.

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

  1. Alveoli

  2. Bronchioles

  3. Bronchi

  4. Alveolar ducts

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Correct Option: B
Explanation:

From the larynx, air moves into lower respiratory tract, starting with the trachea and down to the intersection that branches to form the right and left primary (main) bronchi. Each of these bronchi branch into secondary (lobar) bronchi that branch into tertiary (segmental) bronchi that branch into smaller narrow tube airways called bronchioles that eventually connect with tiny specialized structures called alveoli that function in gas exchange.

So, the correct option is 'Bronchioles'.

In mammals ventilation movements of lungs are governed by.

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

  1. Muscular wall of lungs

  2. Intercostal muscles

  3. Diaphragm

  4. Diaphragm and intercostal muscles.

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Correct Option: D

Number of alveoli in the two human lungs is?

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

  1. $600-800$ million

  2. $200-300$ million

  3. $1-2$ million

  4. $100,000-150,000$

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Correct Option: A
Explanation:
Alveoli are the basic unit of ventilation. The number of alveoli is a key structural determinant of lung architecture. Alveolar number is closely related to total lung volume, with larger lungs having considerably more alveoli, ranging from 600-800 million. 
So, the correct option is '600-800 million'.

Lungs have a large number of alveoli for.

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

  1. Having spongy texture and proper shape

  2. More surface area for diffusion of gases

  3. More space for increasing volume of inspired air

  4. More nerve suply

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Correct Option: B

Air is breathed through.

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

  1. Trachea $\rightarrow$ lungs $\rightarrow$ larynx $\rightarrow$ pharynx $\rightarrow$ alveoli

  2. Nose $\rightarrow$ larynx $\rightarrow$ pharynx $\rightarrow$ bronchus $\rightarrow$ alveoli $\rightarrow$ bronchioles

  3. Nostrils $\rightarrow$ pharynx $\rightarrow$ larynx $\rightarrow$ trachea $\rightarrow$ bronchi $\rightarrow$ bronchioles $\rightarrow$ alveoli

  4. Nose $\rightarrow$ mouth $\rightarrow$ lungs

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Correct Option: C

Presence of large number of alveoli around alveolar ducts opening into bronchioles in mammalian lungs is?

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

  1. Inefficient system of ventilation with little of residual air

  2. Inefficient system of ventilation with high percentage of residual air

  3. An efficient system of ventilation with no residual air

  4. An efficient system of ventilation with little residuak air

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Correct Option: D

Residual air mostly occurs in.

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

  1. Alveoli

  2. Bronchus

  3. Nostrils

  4. Trachea

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Correct Option: A

Trachea is lined with incomplete rings of

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

  1. Fibrous cartilage

  2. Calcified cartilage

  3. Elastic cartilage

  4. Hyaline cartilage

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Correct Option: D
Explanation:
The trachea is also called as windpipe. It is a cartilaginous tube which connects pharynx and larynx to the lungs, allowing passage of air. The wall of the trachea is lined by C shaped incomplete cartilaginous rings to protect it from collapsing during the breathing process due to pressure exerted on its walls by the air. These incomplete rings are made up of hyaline cartilage.
So, the correct answer is 'Hyaline cartilage'.

Gases diffuse over the respiratory surface because of.

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

  1. $pO _2$ is more in alveoli than in blood

  2. $pO _2$ is more in blood than in tissues

  3. $pCO _2$ is more in alveoli than in blood

  4. $pCO _2$ is more in blood than in tissues

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Correct Option: A

Arrange the following in order of increasing volume.
$1$. Tida. volume $2$. Residual volume $3$. Expiratory reserve volume $4$. Vital capacity.

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

  1. $1 < 2 < 3 < 4$

  2. $1 < 4 < 3 < 2$

  3. $1 < 3 < 2 < 4$

  4. $1 < 4 < 2 < 3$

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Correct Option: C