Tag: mechanism of respiration in animals

Questions Related to mechanism of respiration in animals

Which of the following is true for $CO _2$ concentration ?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. More in alveolar air than in expired air

  2. More in expired air than in alveolar air

  3. More in inspired air than in alveolar air

  4. More in inspired air than in expired air

Show answer
Correct Option: A
Explanation:

The concentration of expired air is more in the alveolar air than in expired air due to the partial pressure of carbon dioxide in alveoli is more than the atmosphere.

So the correct option is 'More in alveolar air than in expired air'

Hiccough (hiccup) is due to activity of

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Intercostal muscle

  2. Food in air tract

  3. Diaphragm

  4. Inadequate oxygen in environment

Show answer
Correct Option: C
Explanation:

  • Hiccup is also called as a hiccough. It is an involuntary activity of the diaphragm. During hiccups, the diaphragm muscle shows several involuntary contractions. 
  • When the diaphragm muscle contracts, the opening between the vocal cords snaps shut to check the inflow of air. 
  • This results in the hic or hiccup sound. This results due to irritation of the nerves. 

Thus, the correct answer is 'Diaphragm.'

The diaphragm contracts, resulting in inhalation as the volume of thoracic cavity

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis

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Correct Option: A

Which of the following changes occur in diaphragm and intercoastal muscles when expiration of air takes place?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. External intercostal muscles relax and diaphragm contracts

  2. External intercostal muscles contracts and diaphragm relaxes

  3. External intercostal muscles and diaphragm relaxes

  4. External intercostal muscles and diaphragm contracts

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Correct Option: A

The respiratory centre leading to faster breathing is on account of ________________.

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. Venous blood entering the respiratory centre

  2. Arterial blood entering respiratory

  3. Venous blood leaving the respiratory centre

  4. Arterial blood leaving the respiratory centre

Show answer
Correct Option: A
Explanation:

The medulla oblongata is the primary respiratory control centre. Its main function is to send signals to the muscles that control respiration to cause breathing to occur. The respiratory control centre increase respiratory rate on the account of decrease in blood pH, as the oxygenated blood through veins enter the system, decrease in $CO _2$ levels, increased respiratory rate.

Pneumoconiosis is a type of

biology human body respiration in humans mechanism of respiration in animals human lungs

  1. Emphysema

  2. Occupational renal disease

  3. Occupational respiratory disease

  4. Coronary artery disease

Show answer
Correct Option: C
Explanation:
  • Pneumoconiosis is a disease of the lungs due to inhalation of dust, characterized by inflammation, coughing, and fibrosis. 
  • Pneumoconiosis is usually considered an occupational respiratory disease, and includes asbestosis, silicosis and coal workers' pneumoconiosis (CWP), also known as "Black Lung Disease."

So, the correct option is 'Occupational respiratory disease'.

Fatal degenerative lung disease caused by particulate asbestos is referred to as

biology human body respiration in humans mechanism of respiration in animals human lungs

  1. asbestosis

  2. asthma

  3. allergy

  4. sinusitis

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Correct Option: A

Asbestosis increases the risk of developing all of the following except

biology human body respiration in humans mechanism of respiration in animals human lungs

  1. Carcinoma of the lungs

  2. Mesotheliomas

  3. Bronchiectasis

  4. Tuberculosis

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Correct Option: D

Number of alveoli in human lung is about

biology human body respiration in humans mechanism of respiration in animals human lungs

  1. One million

  2. More than two millions

  3. More than five millions

  4. More than seven millions

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Correct Option: D
Explanation:

(d) The number of alveoli in human lungs has been estimated to be approximately 750 million, exposing a surface area of nearly 100 $m^2$.

If the lung were punctured, which of the following would happen?

biology human body respiration in humans mechanism of respiration in animals human lungs

  1. The lung would collapse on the side of the puncture.

  2. Both the lung and the chest wall would collapse on the side of the puncture.

  3. Inspiratory signals from medulla become irregular

  4. Interpleural pressure decrease further

Show answer
Correct Option: A