2. Use the following diagram to answer the questions below. Start by filling in the blanks for the missing % concentrations for beakers B and C. 150ml 100 Beaker A 0% Sugar 100% Water a) What is the solute concentration of: O Beaker A? o Beaker B? 150ml 100 -60 Beaker B % Sugar b) What is the solvent concentration of Beaker C? 90% Water 150ml 100 18 Beaker C 40% Sugar % Water

Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter3: The Plasma Membrane And Membrane Potential
Section: Chapter Questions
Problem 6RE
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Osmosis
Water moving by diffusion across a membrane is called osmosis. Remember, diffusion is the
movement of molecules from a high concentration to a lower concentration, in order to reach
equilibrium. In the image below, the diamonds represent water and the circles represent
solutes. Water will move by osmosis from the side with a higher concentration of water to a
side with a lower concentration of water. In other words, water will move by osmosis from the
side with a lower concentration of solute to the side with a higher concentration of solute.
Water is attracted to solutes.
2. Use the following diagram to answer the questions below. Start by filling in the blanks for the
missing % concentrations for beakers B and C.
150ml
100
Beaker A
0% Sugar
100% Water
a) What is the solute concentration of:
O Beaker A?
O Beaker B?
150ml
100
Beaker B
% Sugar
90% Water
b) What is the solvent concentration of Beaker C?
150ml
100
Beaker C
40% Sugar
% Water
When we think about solutions in human biology, we mostly think about the intracellular
cytosol compared to extracellular solutions like plasma and interstitial fluid. (Remember, we are
about 68% water.) To describe the relative amounts of solutes on either side of a membrane,
we use the terms hypertonic, hypotonic and isotonic. If the solutions have equal
concentrations of solute, we say that they are isotonic. If the concentration of solute is not
equal, hypotonic describes the side with a lower concentration of solute and hypertonic
describes the solution with a higher concentration of solute. Use the questions below to
practice using these terms.
Transcribed Image Text:Osmosis Water moving by diffusion across a membrane is called osmosis. Remember, diffusion is the movement of molecules from a high concentration to a lower concentration, in order to reach equilibrium. In the image below, the diamonds represent water and the circles represent solutes. Water will move by osmosis from the side with a higher concentration of water to a side with a lower concentration of water. In other words, water will move by osmosis from the side with a lower concentration of solute to the side with a higher concentration of solute. Water is attracted to solutes. 2. Use the following diagram to answer the questions below. Start by filling in the blanks for the missing % concentrations for beakers B and C. 150ml 100 Beaker A 0% Sugar 100% Water a) What is the solute concentration of: O Beaker A? O Beaker B? 150ml 100 Beaker B % Sugar 90% Water b) What is the solvent concentration of Beaker C? 150ml 100 Beaker C 40% Sugar % Water When we think about solutions in human biology, we mostly think about the intracellular cytosol compared to extracellular solutions like plasma and interstitial fluid. (Remember, we are about 68% water.) To describe the relative amounts of solutes on either side of a membrane, we use the terms hypertonic, hypotonic and isotonic. If the solutions have equal concentrations of solute, we say that they are isotonic. If the concentration of solute is not equal, hypotonic describes the side with a lower concentration of solute and hypertonic describes the solution with a higher concentration of solute. Use the questions below to practice using these terms.
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