Endocytosis decreases the abundance of cell surface receptors by recycling them back to the plasma membrane, while exocytosis removes receptors from the cell surface by targeting them for lysosomal degradation.

Endocytosis regulates receptor abundance by internalizing and recycling or degrading receptors, whereas exocytosis increases receptor abundance by delivering newly synthesized receptors to the plasma membrane.

Endocytosis increases the number of cell surface receptors through vesicle fusion, while exocytosis reduces receptor activity by internalizing receptors into the cell.

Endocytosis and exocytosis both decrease receptor abundance on the cell surface by internalizing receptors into vesicles for lysosomal degradation.