bio-201 topic 2: cell physiology & tissues\npractice it\nwhat makes the cell membrane selectively permeable…

bio-201 topic 2: cell physiology & tissues\npractice it\nwhat makes the cell membrane selectively permeable to na+ and k+ ions?\ncholesterol molecules embedded in the membrane\nconcentration gradients of other ions\nion channels that are specific to each ion\ntransporter proteins that actively pump ions across the membrane\nphysical size of the ions

bio-201 topic 2: cell physiology & tissues\npractice it\nwhat makes the cell membrane selectively permeable to na+ and k+ ions?\ncholesterol molecules embedded in the membrane\nconcentration gradients of other ions\nion channels that are specific to each ion\ntransporter proteins that actively pump ions across the membrane\nphysical size of the ions

Answer

Brief Explanations:

Cell membranes have ion - specific channels. For sodium (Na+) and potassium (K+) ions, there are specific ion channels that allow their selective passage, enabling functions like nerve impulse transmission and maintaining cell potential. Cholesterol affects membrane fluidity, ion concentration gradients drive diffusion but don't make the membrane selectively permeable, transporter proteins actively move ions but not what gives selectivity in this context, and ion size isn't the main factor for this selectivity.

Answer:

Ion channels that are specific to each ion