Describe various mechanisms for gastrointestinal absorption. 

The gastrointestinal (GI) tract plays a crucial role in the absorption of nutrients from food. The process of absorption involves the transfer of nutrients from the lumen of the GI tract into the bloodstream or lymphatic system for distribution to the body's tissues and organs. Various mechanisms are involved in the absorption of nutrients in the GI tract. These mechanisms include:

1. Passive Diffusion: Passive diffusion is the simplest mechanism of absorption and involves the movement of nutrients from an area of high concentration to an _________ ________ ________ __________ ______ _________ ____ _________ __________.
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