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).
They vary throughout the day. (Click here for a blood sugar chart.) For someone without diabetes, a fasting blood sugar on awakening should be under 100 mg/dl. Before-meal normal sugars are 70â99 mg/dl. âPostprandialâ sugars taken two hours after meals should be less than 140 mg/dl. Those are the normal numbers for someone without diabetes.
She says regular blood pressure checks should start at age 3, but says that even younger children can have hypertension and should be treated for it. An adult is considered to have high blood pressure when the top number of a blood pressure reading (systolic pressure) is more than 140 mm Hg or when the lower number of a blood pressure reading is more than 90 mm Hg (diastolic pressure).