The renal tubule carries urine from the glomerular capsule to the renal pelvis. 1  The curvy first section of the renal tubule is known as the proximal convoluted tubule. 2  The tubule cells that line the proximal convoluted tubule reabsorb much of the water and nutrients initially filtered into the urine.he renal tubule carries urine from the glomerular capsule to the renal pelvis. 1  The curvy first section of the renal tubule is known as the proximal convoluted tubule. 2  The tubule cells that line the proximal convoluted tubule reabsorb much of the water and nutrients initially filtered into the urine.
The Damper. Cold air is produced in the freezer as liquid refrigerant passes through the evaporator coils and changes into gas. This process causes the surface of the evaporator coils to become extremely cold. A circulation fan blows air over the coils and through a vent into the refrigerator. Within the vent is a damper. The damper is a small flap that controls the flow of air from the freezer to the refrigerator. It is usually found in the top of the fridge or on the back panel near the top. The damper is controlled by a thermostat, which triggers it to open and close depending on the temperature of the air in the refrigerator.
When the freezer reaches temperature, the unit cycles off, no matter what the refrigerator temperature is. Modern computerized refrigerators do not use the damper system. The computer manages fan speed for both compartments, although air is still blown from the freezer. Air from the freezer section is diverted to the refrigerator door, to cool milk or juice stored in the door shelf. 2  A drop down door built into the refrigerator main door, giving easy access to frequently used items such as milk, thus saving energy by not having to open the main door.