Final answer:
The processes described are pinocytosis, where cells take up dissolved substances through a vesicle, and exocytosis, where cells secrete substances into the extracellular space; the correct answer is A) Pinocytosis; exocytosis. Option number a is correct.
Step-by-step explanation:
In the process of pinocytosis, cells take up dissolved substances from the extracellular compartment by forming a furrow into which the substance can enter. Concurrently, when a cell secretes its own products into the extracellular environment, exocytosis is occurring. Therefore, the correct answer is A) Pinocytosis; exocytosis. Pinocytosis is a type of endocytosis, often referred to as 'cell drinking,' where the cell ingests extracellular fluid and the substances dissolved within it. This process results in the formation of a pinocytic vesicle.
In contrast, exocytosis is the process where vesicles within the cell fuse with the plasma membrane to release their contents outside of the cell. It is a crucial mechanism for cells to export products such as proteins or to dispose of waste.