Experiment No: 01
Aim: To observe and analyse the osmoregulation behaviour of blood cells (specifically red
blood cells) when exposed to isotonic, hypotonic, and hypertonic solutions.
Principle:
1. Isotonic Solution:
Definition: An isotonic solution has the same osmotic pressure as the
internal environment of the cells.
Effect on Cells: In an isotonic solution, there is no net movement of water
into or out of the cells, so the cells maintain their normal shape and size.
2. Hypotonic Solution:
Definition: A hypotonic solution has a lower osmotic pressure compared
to the internal environment of the cells.
Effect on Cells: Water moves into the cells due to the lower external
osmotic pressure. This can cause cells to swell and possibly burst
(haemolysis) if the influx of water is excessive.
3. Hypertonic Solution:
Definition: A hypertonic solution has a higher osmotic pressure compared
to the internal environment of the cells.
Effect on Cells: Water moves out of the cells due to the higher external
osmotic pressure. This can cause cells to shrink and become crenated
(crenation).
Materials:
• Fresh blood sample (venous blood from a volunteer or a commercial blood substitute)
• Isotonic solution (e.g., 0.9% NaCl)
• Hypotonic solution (e.g., 0.2% NaCl or Distilled water)
• Hypertonic solution (e.g., 3.0% NaCl)
• Microscopes (light microscopes or cell counters)
• Test tubes or microcentrifuge tubes
• Pipettes and pipette tips
• Centrifuge (optional, for concentration adjustments)
• Incubator (optional, for temperature control)
• Gloves, lab coat, and safety goggles
Procedure:
1. Preparation of Solutions:
Ensure all solutions are at room temperature or the desired temperature for
the experiment.
Label three test tubes as Isotonic, Hypotonic, and Hypertonic.
1
Aim: To observe and analyse the osmoregulation behaviour of blood cells (specifically red
blood cells) when exposed to isotonic, hypotonic, and hypertonic solutions.
Principle:
1. Isotonic Solution:
Definition: An isotonic solution has the same osmotic pressure as the
internal environment of the cells.
Effect on Cells: In an isotonic solution, there is no net movement of water
into or out of the cells, so the cells maintain their normal shape and size.
2. Hypotonic Solution:
Definition: A hypotonic solution has a lower osmotic pressure compared
to the internal environment of the cells.
Effect on Cells: Water moves into the cells due to the lower external
osmotic pressure. This can cause cells to swell and possibly burst
(haemolysis) if the influx of water is excessive.
3. Hypertonic Solution:
Definition: A hypertonic solution has a higher osmotic pressure compared
to the internal environment of the cells.
Effect on Cells: Water moves out of the cells due to the higher external
osmotic pressure. This can cause cells to shrink and become crenated
(crenation).
Materials:
• Fresh blood sample (venous blood from a volunteer or a commercial blood substitute)
• Isotonic solution (e.g., 0.9% NaCl)
• Hypotonic solution (e.g., 0.2% NaCl or Distilled water)
• Hypertonic solution (e.g., 3.0% NaCl)
• Microscopes (light microscopes or cell counters)
• Test tubes or microcentrifuge tubes
• Pipettes and pipette tips
• Centrifuge (optional, for concentration adjustments)
• Incubator (optional, for temperature control)
• Gloves, lab coat, and safety goggles
Procedure:
1. Preparation of Solutions:
Ensure all solutions are at room temperature or the desired temperature for
the experiment.
Label three test tubes as Isotonic, Hypotonic, and Hypertonic.
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