The impact of income on life satisfaction tends to be more significant as the overall levels of life satisfaction of a society decrease. Thus, when comparing countries, the income-related gap between economic strata regarding life satisfaction increases as the overall level for a country gets lower.
The medulla (the brain stem) contains the cardiac, respiratory, vomiting, and vasomotor centers and regulates autonomic, involuntary functions such as breathing, heart rate, and blood pressure.
