Tag: respiration in humans

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

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

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During inhalation, the contraction of the diaphragm and external intercostal muscles increases the volume of the thoracic chamber. Specifically, the contraction of the dome-shaped diaphragm increases the volume along the anteroposterior axis, while rib elevation increases the dorsoventral axis.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

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

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

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

Pneumoconiosis is a type of

  1. Emphysema

  2. Occupational renal disease

  3. Occupational respiratory disease

  4. Coronary artery disease
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Asbestosis increases the risk of developing all of the following except

  1. Carcinoma of the lungs

  2. Mesotheliomas

  3. Bronchiectasis

  4. Tuberculosis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Asbestosis is a known risk factor for lung carcinoma and mesothelioma. Tuberculosis is an infectious disease caused by bacteria, not a direct consequence of asbestos fiber inhalation.

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

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

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

If the lung is punctured, the intrapleural space is exposed to atmospheric pressure. This eliminates the negative pressure that keeps the lung inflated, causing the lung to collapse (pneumothorax).

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

Which one of the following statements is incorrect?

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

Residual air in the lungs is essential to keep the alveoli from collapsing between breaths; it does not decrease the efficiency of respiration but rather maintains structural integrity. The other statements correctly describe respiratory adaptations in birds, insects, and fish.