An AC system has many components: compressor, condenser, receiver dryer, evaporator, and hoses. The compressor, the âheartâ of the carâs air conditioning system works like a pump taking refrigerant, (R-12 in older cars, R-134a in 1995 and newer cars) and pressurizing it, passing it along to the evaporator. The AC compressor has several moving parts (including pistons and valves).
Quick Answer. According to WebMD, a normal blood pressure is lower than 120/80. This means that the systolic number is 120 or lower, and the diastolic number is 80 or lower. The systolic number measures artery pressure when the heart contracts. The diastolic number measures artery pressure between heartbeats.
Your doctor will give you a blood pressure goal. An example of a goal is to keep blood pressure below 140/90. Your goal may be lower or higher based on your health and age. Your blood pressure goal can help you prevent problems caused by high blood pressure. You may have to take more than one medicine to find the right mix to lower your blood pressure. 2  You will still need to make lifestyle changes to lower your risk of heart attack and stroke. 3  Medicines help control your blood pressure and lower your risk of heart attack and stroke.