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Why does the red blood cell lyse in an isosmotic solution of urea?
Urea is isosmotic to the intracellular fluid of red blood cells, but because the membranes of the blood cells are permeable to urea. Urea enters the cell at a much more rapid rate than other permeable solutes (because of the steep concentration gradient) and the cell fills to it bursts.
What channels does water cross plasma membranes?
Aquaporins.
What are the penetrating solute?
Penetrating solutes are molecules that can cross a membrane barrier easily due to their chemical properties, such as size and lipophilicity. Examples include urea, ethanol, and acetone. These solutes can equilibrate across cell membranes rapidly, impacting cell function and osmotic balance.
Why is urea absorption an active process?
Urea absorption is considered an active process because it requires energy to move urea against its concentration gradient. This is facilitated by transport proteins in the cell membranes of the renal tubules, which utilize ATP to actively transport urea from areas of lower concentration to areas of higher concentration. This active transport mechanism is crucial for maintaining proper nitrogen balance and facilitating the reabsorption of water in the kidneys.
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
Do hydrophobic molecules cross cell membranes?
Yes, hydrophobic molecules can cross cell membranes because cell membranes are made up of a phospholipid bilayer that is permeable to nonpolar molecules like hydrophobic ones.
What are various mechanisms by which substances cross membranes?
there are many different types of mechanisms that can make thing cross cell membranes two of these are by diffusing and active transport.
How do penetrating and non-penetrating solutes differ in their ability to cross cell membranes?
Penetrating solutes can cross cell membranes easily due to their ability to dissolve in lipids, while non-penetrating solutes cannot cross cell membranes easily because they do not dissolve in lipids.
Why does the red blood cell lyse in an isosmotic solution of urea?
Urea is isosmotic to the intracellular fluid of red blood cells, but because the membranes of the blood cells are permeable to urea. Urea enters the cell at a much more rapid rate than other permeable solutes (because of the steep concentration gradient) and the cell fills to it bursts.
What channels does water cross plasma membranes?
Aquaporins.
What are the penetrating solute?
Penetrating solutes are molecules that can cross a membrane barrier easily due to their chemical properties, such as size and lipophilicity. Examples include urea, ethanol, and acetone. These solutes can equilibrate across cell membranes rapidly, impacting cell function and osmotic balance.
Why cant we use industrial CO2 to mfr urea fertilizer and save the globe from destruction. in fact it was my project in final year engg to design a suitable reactor for making urea.?
Urea is industrially obtained from ammonia and carbon dioxide.
What must digested food particles be able to do?
cross our cell membranes
What is a factor that determines whether molecules can cross a cell membranes?
mass
Why is urea absorption an active process?
Urea absorption is considered an active process because it requires energy to move urea against its concentration gradient. This is facilitated by transport proteins in the cell membranes of the renal tubules, which utilize ATP to actively transport urea from areas of lower concentration to areas of higher concentration. This active transport mechanism is crucial for maintaining proper nitrogen balance and facilitating the reabsorption of water in the kidneys.
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
