Question

Characterize each term as pertaining to either simple or facilitated diffusion.

Simple diffusionFacilitated diffusion

options are O2 Na+ directly through membrane via channel polar molecules and lipophilic molecules

Answer 1

Ans- A few molecules can go through cell membranes since they break down in the lipid bilayer. Such particles are called lipophilic molecules. The steroid hormones give a physiological model. These cholesterol family members can go through a layer in their way of development, however, what decides the course where they will move? Such molecules will go through a film situated down their fixation angle in a procedure called simple diffusion. As per the Second Law of Thermodynamics, particles precipitously move from a locale of higher concentration to one of lower concentration. Along these lines, for this situation, an entropy increase powers transport over the membrane.

Matters become progressively complicated when the particle is exceptionally polar. For instance, sodium particles are available at 143 mM outside the cell and 14 mM inside the cell, yet sodium doesn't freely enter the cell in light of the fact that the decidedly charged particle can't go through the hydrophobic membrane inside. In certain conditions, as during a nerve impulse, sodium ions must enter the cell. How are they ready to do as such? Sodium particles go through explicit diverts in the hydrophobic barrier formed by membrane proteins. This method for intersection the membrane is called facilitated diffusion in light of the fact that the dispersion over the membrane is encouraged by the channel. It is additionally called passive transport, on the grounds that the energy driving the particle development begins from the particle inclination itself, with no commitment by the transport system. Channels, similar to enzymes, show substrate particularity.