[Answer] Which of the following particles could diffuse easily through a cell membrane? Glucose Oxygen (O2) Hydrogen ion (H+) Sodium ion (Na+)

Answer: Oxygen

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Which of the following particles could diffuse easily through a cell membrane? Glucose Oxygen (O2) Hydrogen ion (H+) Sodium ion (Na+) Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. Being passive facilitated transport does not directly require chemical energy from ATP hydrolysis in the transport step itself ... Ion channels allow inorganic ions such as sodium potassium calcium or chlorine to diffuse down their electrochemical gradient across the lipid bilayer through hydrophilic pores across the membrane. Membrane transport - Wikipedia Passive transport - Wikipedia Blood–brain barrier - Wikipedia In order to enable the electrochemical reactions at the electrodes protons electrons and the reactant gases ( hydrogen or oxygen ) must gain access to the surface of the catalyst in the electrodes while the product water which can be in either liquid or gaseous phase or both phases must be able to permeate from the catalyst to the gas outlet. Upon inhalation oxygen is brought into the lungs and quickly diffuses across the membrane of alveoli and enters the circulatory system by diffusing across the membrane of the pulmonary capillaries. Simultaneously carbon dioxide moves in the opposite direction diffusing across the membrane of the capillaries and entering into the alveoli where it can be exhaled. For those non-electrolytes whose transport through the membrane is mediated by a transport protein the ability to diffuse is generally dependent on the partition coefficient K. Partially charged non-electrolytes that are more or less polar such as ethanol methanol or urea are able to pass through the membrane through aqueous channels immersed in the membrane . Facilitate...

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