Ventilation is the process of air going in and out of lungs. Increased ventilation elevates the oxygen level in arterial blood. It also alters the pH of blood, calcium level affecting the nerves, muscles etc. Solution Ventilation is the process of air going in and out of lungs. Increased ventilation elevates the oxygen level in arterial blood. It also alters the pH of blood, calcium level affecting the nerves, muscles etc..