Final answer:
True (option a), vesicles switch over to microfilament tracks for local movement in the actin-rich periphery of the cell because microfilaments are responsible for processes like cell motility and shape change.
Step-by-step explanation:
The question is regarding the switch of vesicles from microtubule tracks to microfilament tracks for local movement through the actin-rich periphery of the cell. The statement given is that vesicles indeed switch over to microfilament tracks for local movement in these regions. This process occurs due to the dynamic nature of actin microfilaments and their ability to reorganize, which is essential for processes such as cell shape change, cytokinesis, and cell motility. Motor proteins, associated with actin filaments, enable this local movement.
While microtubules are typically responsible for long-distance transport of vesicles and organelles inside the cell, it is the microfilaments that play a crucial role in the periphery for local movement. This supports the notion that vesicles switch to microfilament tracks in actin-rich areas of the cell.