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Haemolysis

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eMusic Study Pack • Biology
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📖 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

Verse 1 Haemo...... Haemolysis uh uh When red blood cells are placed in a solution less concentrated than their cell sap - hypotonic, yea water enters the cells by endosmosis. All Water rushes in, membranes part red spreads free, a vivid start. uh Swell and burst, the colour flows haemoglobin shows where life once glows. As water continues to enter, the cells swell and may burst open, releasing their contents. The released red pigment - haemoglobineh eh eh eh mixes with the surrounding fluid, giving it a reddish color. Chorus Haemolysis is the bursting or destruction of red blood cells when they are placed in a hypotonic solution, hmmmmmmmm causing water to move into the cells by osmosis, leading to their rupture and the release uh yea of haemoglobin. Outro 2 Placing red blood cells in isotonic solution prevents haemolysis. yeap In hypertonic solution, the opposite occurs — uh uh the cells shrink, a process called crenation. All... Water rushes in, membranes part red spreads free, a vivid start. uh Swell and burst, the colour flows haemoglobin shows where life once glows. Chorus Haemolysis is the bursting or destruction of red blood cells when they are placed in a hypotonic solution, hmmmmmmmm causing water to move into the cells by osmosis, leading to their rupture and the release uh yea of haemoglobin.
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📊 Line-by-Line Study Guide

Lyric LineExplanation
When RBCs are placed in a hypotonic solutionHypotonic: external solute concentration lower than inside the cell → water enters by osmosis.
Water enters the cells by endosmosisEndosmosis = 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 crenationIsotonic: no net water movement. Hypertonic: water leaves cell → cells shrink (crenation).
Osmosis as the driving mechanismWater 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

Q1: Define haemolysis.
The rupture/destruction of RBCs due to water entering the cell by osmosis in a hypotonic solution.
Q2: What causes crenation?
Placing cells in a hypertonic solution (water leaves the cell), causing them to shrink.
Q3: How does isotonic solution affect RBCs?
No net water movement — cells maintain their normal shape and haemolysis is prevented.
Q4: Why does haemoglobin color the surrounding fluid?
Because haemoglobin is released from ruptured RBCs and disperses in the medium, turning it reddish.

🎯 Drag & Drop

Drag each example into the matching category box.

Hypotonic effect
Hypertonic effect
Isotonic
Water enters cell, swelling
Cell bursts; haemoglobin released
Cell shrinks (crenation)
No net change in cell volume

📌 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).