Final answer:
Non-vesicular lipid traffic is the movement of lipids between membranes without using vesicles, contrasted with vesicular traffic. VLDLs carrying triglycerides from liver to fat tissues is an example of this process outside the cellular vesicular transport system.
Step-by-step explanation:
Non-Vesicular Lipid Traffic
Non-vesicular lipid traffic refers to the transfer of lipids between cellular membranes without the use of vesicles. This is in contrast to vesicular traffic, which involves the transport of lipids and proteins in membrane-bound vesicles. Non-vesicular lipid transport is essential for maintaining lipid composition across organelles and is facilitated by lipid transfer proteins. An example of non-vesicular traffic can be seen with Very low-density lipoproteins (VLDL), which are responsible for the transport of newly synthesized triglycerides from the liver to the fatty tissues. VLDLs are secreted into the bloodstream and are not part of the vesicular trafficking pathway within cells.