How do substances move across cell membranes?
substances are transported across cell membranes via passive, active and bulk transport process.
- passive transport occurs when substances can cross the semipermeable plasma and organelles membranes and move down the concentration gradient without using energy and happen through diffusion, facilitated diffusion and osmosis.
- active transport occurs when substances are transported up their concentration gradient from a lower to a higher concentration. sodium potassium pump is an active transport mechanism that maintains homeostasis to be electrolytes sodium and potassium.

He leaned his head against the wall; his eyes were shut, his hands clasped in each other, and his body seemed to be sustained in an upright position merely by the cellar-door against which he rested his left shoulder. the lethargy into which he was sunk seemed scarcely interrupted by my feeling his hand and his forehead. his throbbing temples and burning skin indicated a fever . . there was only one circumstance that hindered me from forming an immediate determination in what manner this person should be treated. my family consisted of my wife and a young child. our servant-maid had been seized, three days before, by the reigning malady, and, at her own request, had been conveyed to the hospital. we ourselves enjoyed good health, and were hopeful of escaping with our lives. our measures for this end had been cautiously taken and carefully adhered to. they did not consist in avoiding the receptacles of infection, for my office required me to go daily into the midst of them; nor in filling the house with the exhalations of gunpowder, vinegar, or tar. they consisted in cleanliness, reasonable exercise, and wholesome diet. who is the story’s first-person narrator

Where do i find advocacy articles for 2.04 english 4? this is for the first amendment.

Boss: oh no! that’s the phone again! secretary: blank boss: . a. shall i take it? b. will you answer it? c. can you do me a favor? d. may i hang it up?