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.
During aerobic, upright exercise, such as walking, people will experience an increase in systolic blood pressure and a slight decrease in diastolic blood pressure. Systolic blood pressure increases to improve blood flow, which is necessary to provide higher levels of oxygen to working muscles.lood pressure readings consider two numbers: systolic and diastolic pressure. Systolic blood pressure is the pressure in the arteries when the heart beats, while diastolic blood pressure is the pressure in the arteries between heartbeats when the heart is resting and refilling with blood.