Choose factors that STIMULATE neurons of the DORSAL respiratory group in medulla: Select one or more:Pneumotaxic center neurons activityArterial chemoreceptors activityCentral chemoreceptors activityLung stretch receptors activityApneustic center neurons activity

The factors that stimulate neurons of the Dorsal respiratory group in medulla are:

1. Arterial chemoreceptors activity: These receptors respond to changes in the partial pressure of oxygen and carbon dioxide in the arterial blood. When there's a decrease in oxygen or an increase in carbon dioxide, they stimulate the dorsal respiratory group to increase the rate and depth of respiration.

2. Central chemoreceptors activity: These receptors are located in the medulla and they respond to changes in the concentration of hydrogen ions in the cerebrospinal fluid. When there's an increase in hydrogen ions (which usually occurs when there's an increase in carbon dioxide), they stimulate the dorsal respiratory group to increase the rate and depth of respiration.

3. Lung stretch receptors activity: These receptors are located in the lungs and they respond to the degree of lung inflation. When the lungs are excessively inflated, they stimulate the dorsal respiratory group to inhibit inspiration, preventing overinflation of the lungs.

The activity of Pneumotaxic center neurons and Apneustic center neurons does not directly stimulate the dorsal respiratory group. The Pneumotaxic center regulates the rate and depth of breathing, while the Apneustic center promotes inspiration.