Saline is a solution that contains a certain amount of NaCl and is designed to have the same osmotic pressure as normal blood cells. Doctors often give saline to patients who have lost blood. Which of the following explains why glucose of the same molality cannot attain the same effect as saline?
A. Each formula unit of NaCl will give two particles because of ionization, but each molecule of glucose dissolves to give only one particle. Osmotic pressure for glucose will be lower than is required.
B. Glucose would not maintain osmotic pressure because on dissociation it forms two particles per formula unit, but NaCl would give only one particle per formula unit. Osmotic pressure is higher when the number of particles decreases.
C. Osmotic pressure increases with the decrease in the number of particles of solute in the solution. NaCl provides fewer particles per formula unit than glucose does.
D. Sodium and chloride ions can pass freely through the membranes of red blood cells, but glucose molecules cannot pass through the membranes.
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a)
Patients who have los blood or having less blood pressure, need to improve blood pressure inside the blood vessels. This pressure is Osmotic pressure. Osmotic pressure depends on the number of particles (molecules or ions) and their concentration in the solute. Na Cl dissociates into two ions. Sugar/sucrose/glucose does not dissociate in water or blood into ions. So 0.9% saline solution gives as much pressure as 5% dextrose solution.
Water goes through the semipermeable membrane of cells. As the pressure outside the cell is increased due to saline water, water from the injected solution goes into cells to decrease dehydration and consequently increase blood content later on.
The solute particles like sodium, chloride, dextrose cannot pass through the semipermeable cell membrane.
Actually a patient is given pure saline solution or saline with some dextrose solution. That depends on the condition of the patient and whether he/she needs minerals/salts/dextrose or not, in addition to rehydration of the patient's body.
Patients who have los blood or having less blood pressure, need to improve blood pressure inside the blood vessels. This pressure is Osmotic pressure. Osmotic pressure depends on the number of particles (molecules or ions) and their concentration in the solute. Na Cl dissociates into two ions. Sugar/sucrose/glucose does not dissociate in water or blood into ions. So 0.9% saline solution gives as much pressure as 5% dextrose solution.
Water goes through the semipermeable membrane of cells. As the pressure outside the cell is increased due to saline water, water from the injected solution goes into cells to decrease dehydration and consequently increase blood content later on.
The solute particles like sodium, chloride, dextrose cannot pass through the semipermeable cell membrane.
Actually a patient is given pure saline solution or saline with some dextrose solution. That depends on the condition of the patient and whether he/she needs minerals/salts/dextrose or not, in addition to rehydration of the patient's body.
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