Tag: gas exchange in humans

Quizzes (12) Questions (102)

Questions Related to gas exchange in humans

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

Lungs have a large number of narrow tubes called.

  1. Alveoli

  2. Bronchioles

  3. Bronchi

  4. Alveolar ducts
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

In mammals ventilation movements of lungs are governed by.

  1. Muscular wall of lungs

  2. Intercostal muscles

  3. Diaphragm

  4. Diaphragm and intercostal muscles.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ventilation in mammals is achieved by changing the volume of the thoracic cavity, which is controlled by the contraction and relaxation of the diaphragm and the intercostal muscles.

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

Number of alveoli in the two human lungs is?

  1. $600-800$ million
  2. $200-300$ million
  3. $1-2$ million
  4. $100,000-150,000$
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

Lungs have a large number of alveoli for.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The large number of alveoli maximizes the surface area available for the diffusion of oxygen and carbon dioxide, which is essential for efficient respiration.

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

Air is breathed through.

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air follows the pathway: Nostrils -> Pharynx -> Larynx -> Trachea -> Bronchi -> Bronchioles -> Alveoli.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The presence of alveoli allows for efficient gas exchange. Residual air (the air remaining in lungs after forced expiration) is a normal feature of mammalian lungs that prevents collapse.

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

Trachea is lined with incomplete rings of

  1. Fibrous cartilage

  2. Calcified cartilage

  3. Elastic cartilage

  4. Hyaline cartilage
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

Gases diffuse over the respiratory surface because of.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gas diffusion occurs from areas of higher partial pressure to areas of lower partial pressure. Oxygen diffuses from the alveoli (high pO2) into the blood (low pO2).

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

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

  1. $1 < 2 < 3 < 4$
  2. $1 < 4 < 3 < 2$
  3. $1 < 3 < 2 < 4$
  4. $1 < 4 < 2 < 3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tidal volume (approx 500ml) < Expiratory reserve volume (approx 1000-1200ml) < Residual volume (approx 1200ml) < Vital capacity (approx 4600ml).