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All plasma membranes are composed of phospholipids, cholesterol, proteins, glycoproteins and glycolipids. The structure of the membrane can be described by the fluid mosaic model, where phospholipids are ...

ADH stands for anti-diuretic hormone. It is a hormone that increases the permeability of the distal convoluted tubule and the collecting duct to water ADH is produced in the hypothalamus and stored in the...

Gas exchange surfaces tend to have the adaptation a large SA:volume ratio. This is advantageous as it increases the area over which gases and other materials can be transported into and out of the organis...

Nerve impulses are propagated in the form of action potentials, involving the rapid depolarisation of the nerve cell membrane from  -70mV to +30mV, before repolarisation occurs returning the membrane pote...

This is a common and understandable mistake that is made since essentially both of these processes refer to molecules being moved out of the cytoplasm of a cell using energy. There is however a major diff...