BIOL 115 Lecture Notes - Lecture 15: Nephron, Passive Transport, Descending Limb Of Loop Of Henle
Document Summary
The rate of movement is too slow, meaning nitrogenous wastes can accumulate. Not all wastes can be removed through diffusion, as some wastes such as uric acid must actively move against the concentration gradient. Too much water may be lost in urine, resulting in dehydration of the organism. Movement of water may make wastes too dilute for excretion by diffusion. Distinguish between active and passive transport and relate these processes occurring in the mammalian kidney. Active transport: uses energy to transport substances across a membrane it would normally not be able to across due to diffusion gradient or its own properties. Passive transport: is the movement of substances across a membrane without energy expenditure. A kidney is made up of nephrons, with a nephrons being made up of a bowman"s capsule, leading to the loop of henle, connected to the distal tubule, this connects to the collecting duct which leads to the bladder.
