Cell diffusion is not particularly limited by molecular distribution. The rate considers the external temperature, distance to travel, time, solute's mass, solvent's density, and possible imperfections to the membrane. Although the investigation will involve passive transport, it is important to note, within a cell, there are various forms of selectivity. The plasma membrane's interior, exterior, protein channels, and amphiphilic nature all limit what molecules would enter the cell and how much. Understanding both active and passive transport occur simultaneously enforces molecular transportation to be complex.

Movement of molecules across the cell membrane occurs by diffusion, active or passive transport.

Explanation:

Cell membrane are specifically penetrable, controlling which substances can go through, just as the amount of every substance can enter or exit at a given time. Specific permeability is fundamental to cells' capacity to get supplements, take out wastes, and keep up a steady inside condition unique in relation to that of the environment (homeostasis). Passive transport doesn't require the cell to consume any ATP and includes a substance diffusing down its concentration gradient across its membrane. In active transport, molecules cross the membrane using ATP.