Question

Which one of the following is the CORRECT statement for respiration in humans?  

Options

• Emphysema is characterized by inflammation of the bronchi. 

• Neural signals from the pneumotaxic centre in the pons region of the brain can increase the duration of inspiration.

• Workers in grinding and stone-breaking industries may suffer from lung fibrosis.

• About 90% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin. 

Answer 1

Workers in grinding and stone-breaking industries may suffer from lung fibrosis.

Explanation:

The damage to the alveolar walls that results in a reduction in the respiratory surface area is what distinguishes emphysema. The length of inspiration can be shortened by neural signals coming from the pneumotaxic centre in the pons area of the brain.

Carbamino-haemoglobin, which carries 20–25% of the carbon dioxide, is a component of haemoglobin.