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How does oxygen pass from alveoli into blood? Is this process passive, like osmosis, or is the membrane active? That is, does it resemble cell membranes, where the integrated membrane proteins are actively transporting chemicals?
During the inhalation, we inhale the atmospheric air which contains not only the molecular oxygen but nitrogen and several other gases. In alveoli, oxygen has a greater concentration than it...
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Is a kidney cell an example of a sex cell, a germ cell, a somatic cell or a haploid cell?
Kidney is not a reproductive organ, hence there is no germ cell or haploid cell in kidney. Cells in kidney are all diploid.
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Describe the cell membrane, cell wall, nucleus, and cytoplasm. Which of these structures are you likely to find in a prokaryotic cell, Eukaryotic cell, plant cell or animal cell?
Basic Definitions: = the semi-permeable structure that surrounds the cell and keeps all of the cells organelles from exploding everywhere. Cell Wall = the rigid 'armor' of the...
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How do cell membranes protect the cell?
Cell membranes are also called selectively permeable membranes, because they are selective in allowing entry of particles into the cell. Think about the mesh net of the windows of your...
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What molecules prevent cell membranes from dissolving?
Picture a lipid molecule as a rectangle. On one end of the rectangle, the bottom of the lipid molecule is hydrophilic, which is the water-loving , polar end of the...
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What are the differences between diffusion, osmosis, facilitated diffusion & active transport? How are these processes related to transport across cell membranes?
1) : Is the movement of molecules / ions from a region of higher to lower concentration. It may or may not occur across a semi permeable membrane. In...
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How does filtration across cell membranes occur?
The hydrophobic tails of the phospholipids prevent the polar molecules to pass in the cell or substances like glucose and to pass out of the cell. The big molecules are...
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Why do molecules like glucose require a carrier protein to get across the cell membrane?
The cell membrane is a made of two layer of phospholipids, and each is made of two parts, a hydrophobic tail and a hydrophilic head. The tails meet making the...
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How does oxygen and carbon dioxide move across cell membranes in humans?
Simple diffusion is responsible for the spread of an air freshener through a room, or of a few drops of dye to eventually turn a glass of water a uniform...
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What do you call movement across a cell membrane that does not require energy from the cell?
Passive transport does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy. The rate of passive...
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