Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
Does osmosis occur if a cell is placed in an isotonic solution?
Transcribed Image Text:**Osmosis and Solutions: A Visual Guide**
**U-tube Illustration:**
- **Before Osmosis:**
- The U-tube is divided by a selectively permeable membrane. On both sides of the U-tube, there are water molecules (small dots) and sugar molecules (larger dots).
- Water molecules are randomly dispersed, and sugar molecules are more concentrated on the right side.
- **After Osmosis:**
- Water has moved from the left to the right side, diluting the concentration of sugar molecules on the right.
- The water level is higher on the right side due to osmosis.
**Diagrams on Types of Solutions:**
- **Cell in Isotonic Solution:**
- Contains equal concentration of water molecules inside and outside the cell.
- Water molecules move in and out of the cell at the same rate (indicated by bidirectional arrows).
- No net change in cell size.
- **Cell in Hypotonic Solution:**
- Higher concentration of water molecules outside the cell.
- Water enters the cell by osmosis (indicated by arrows pointing inward).
- Causes the cell to swell.
- **Cell in Hypertonic Solution:**
- Higher concentration of dissolved particles outside the cell, leading to a lower concentration of water outside.
- Water leaves the cell by osmosis (indicated by arrows pointing outward).
- Causes the cell to shrink.
**Summary:**
This visual guide illustrates how osmosis affects cells in various solutions, demonstrating water movement across selectively permeable membranes in isotonic, hypotonic, and hypertonic conditions. Refer to the U-tube pictures when answering related questions.
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