Many biological phenomena, like respiration, osmoregulation or nerve conduction, have a basis in physical processes like diffusion and osmosis. Definitions and diagrams may contain nuances that students may miss, especially when these are not viewed through the lens of physics. In this article, Nagarjuna G., Former Professor, Homi Bhabha Centre for Science Education, TIFR gives examples of some of these misconceptions and offers simple simulations to provide a more accurate picture of these processes.