Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. Anxiety in lay man’s term means uneasiness, discomfort and nervous reaction leading to fear. Excessive anxiety can result in anxiety. It might lead to stomach aches, short breaths, nausea, chest pains, irregular heartbeats, frequent urination, muscle tension,slaapproblemen (sleeping problem), excessive sweating and trembling. Depression alternatively is often a much more of a psychological problem. It’s your response to any kind of loss or misfortune. It is the mind-set where people experience deficiency of energy and interest to do any pursuit, have pessimism, remain gloomy and sad, discouraged and show low self confidence.