Tag: respiration in humans

Questions Related to respiration in humans

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Lungs are enclosed in?

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

  1. Periosteum

  2. Perichondrium

  3. Pericardium

  4. Pleural membrane

Show answer
Correct Option: A

Which one of the following statements is incorrect?

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

  1. The residual air in lungs slightly decreases the efficiency of respiration in mammals

  2. The presence of non-respiratory air sacs, increases the efficiency of respiration in birds

  3. In insects, circulating body fluids serve to distribute oxygen to tissues

  4. The principle of counter current flow facilities efficient respiration in gills of fishes

Show answer
Correct Option: A