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

Explanation

All options are explained below: a)Cigarette smoking may lead to inflammation of bronchi: Cigarette smoking is a well-known risk factor for chronic bronchitis, which involves inflammation of the bronchi. The chemicals in cigarette smoke can irritate and damage the airways, leading to inflammation. b) Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration: The pneumotaxic center in the pons region of the brain helps regulate the duration and rate of respiration. Neural signals from this center can influence the duration of inspiration. c) Asthma is a condition in which your airways narrow and swell and may produce extra mucus:This statement is accurate. Asthma is a chronic respiratory condition characterized by the narrowing and swelling of the airways (bronchioles) and increased mucus production. These factors can lead to breathing difficulties. d) About 90% of carbon dioxide (CO2) is carried by hemoglobin as carbamino-hemoglobin:This statement is not accurate. While hemoglobin does play a role in transporting carbon dioxide (CO2) in the blood, the majority of CO2 is carried in the blood primarily in the form of bicarbonate ions (HCO3-) dissolved in the plasma. Hemoglobin's primary role is to transport oxygen, and only a small portion of CO2 is transported by hemoglobin as carbamino-hemoglobin. Correct Option: C. Asthma is a condition in which your airways narrow and swell and may produce extra mucus. Summary: The correct statement is that asthma is a condition characterized by the narrowing and swelling of the airways, often accompanied by increased mucus production. Cigarette smoking can indeed lead to bronchial inflammation, the pneumotaxic center in the brain influences respiration, and hemoglobin's main role is oxygen transport, with CO2 primarily transported as bicarbonate ions.