📖 Comprehensive Note
Haemolysis (hemolysis) is the rupture or destruction of red blood cells (RBCs) that occurs when water moves into the cells by osmosis. This typically happens when RBCs are placed in a hypotonic solution (less concentrated than the cell's interior): water enters the cell, the cell swells and may burst, releasing haemoglobin into the surrounding fluid (which gives the liquid a reddish color).
In an isotonic solution no net water movement occurs and haemolysis is prevented. In a hypertonic solution, water leaves the cells and they shrink — a process called crenation.
🎤 Lyrics + Audio
📊 Line-by-Line Study Guide
| Lyric Line | Explanation |
|---|---|
| When RBCs are placed in a hypotonic solution | Hypotonic: external solute concentration lower than inside the cell → water enters by osmosis. |
| Water enters the cells by endosmosis | Endosmosis = net inward movement of water across the plasma membrane. |
| Cells swell and may burst (haemolysis) | Excess water causes membrane tension and rupture, releasing haemoglobin. |
| Released red pigment (haemoglobin) | Haemoglobin leaks into the medium, giving it a red tint — indicator of haemolysis. |
| Isotonic prevents haemolysis; hypertonic causes crenation | Isotonic: no net water movement. Hypertonic: water leaves cell → cells shrink (crenation). |
| Osmosis as the driving mechanism | Water moves down its water potential / towards higher solute concentration across a semipermeable membrane. |
💡 Mnemonic
"HIP" — Hypotonic → Inflate → Pop (reminds you hypotonic causes swelling and possible rupture)
❓ Quiz
1. Haemolysis occurs when RBCs are placed in a:
2. Process that causes water to enter RBCs:
3. What is released when RBCs burst?
4. Which condition prevents haemolysis?
5. What happens in hypertonic solution?
🃏 Flashcards
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📌 Summary
- Haemolysis = bursting of RBCs caused by water entering in a hypotonic environment.
- Water moves into RBCs by osmosis; haemoglobin is released on rupture, coloring the surrounding fluid.
- Isotonic solutions prevent haemolysis; hypertonic solutions cause crenation (shrinkage).