During forced respiration, what is predominantly increased?

During forced respiration, tidal volume is predominantly increased. Tidal volume refers to the amount of air that is inhaled or exhaled during normal breathing. During forced respiration, which occurs during vigorous activities like exercise or when taking a deep breath, the body requires greater ventilation to meet the elevated demand for oxygen and to remove carbon dioxide.

As a result, the respiratory system not only increases the frequency of breaths but also significantly augments the volume of each breath taken. This increase in tidal volume enables a more substantial volume of air to enter the lungs, facilitating oxygen absorption and carbon dioxide expulsion at an enhanced rate.

While other factors like respiratory rate may also increase during forced respiration, the hallmark characteristic is the increase in tidal volume, as it is essential for amplifying the overall ventilation and gas exchange efficiency within the lungs.