Most of the nephron is permeable to urea except for the cortical portion of the distal tubule. As the filtrate descends into the medulla, urea diffuses into the loop of Henle down its concentration gradient, causing the urea concentration in the tubule to rise.he loop of Henle. The loop of Henle is the portion of the kidney that creates the conditions by which the kidney can form concentrated urine (i.e. urine with an osmolality greater than plasma) later on in the nephron.
Battery Voltage : Normally a charged cell in rest is around 2.1 Volts which yields in 12.6 Volts for a charged battery at rest. When the battery is being charged by the car alternator the voltage will vary usually between 14 and 14.4 Volts.
Three Methods: Check Your Battery with a Voltmeter Check Your Battery with a Power Probe Check Your Battery by Cranking the Engine. You get into your car and discover that the engine won't start and that the headlights won't turn on. After you jump start the car, you should find out whether or not you need a new battery or alternator. Follow these steps to check a car battery. Ad.