Editing Cell Biology (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Simulating Cellular Osmosis:'''
<syntaxhighlight lang="python">
def simulate_osmosis(external_salt_concentration):
    """
    Simulates how water moves across the cell membrane.
    Internal concentration is fixed at 0.9% (Isotonic).
    """
    internal = 0.9
    if external_salt_concentration < internal:
        return "Hypotonic: Water enters cell. Cell swells (may burst)."
    elif external_salt_concentration > internal:
        return "Hypertonic: Water leaves cell. Cell shrivels."
    else:
        return "Isotonic: Water moves in and out equally. Cell is stable."

# Scenarios
print(f"Drinking ocean water (3.5% salt): {simulate_osmosis(3.5)}")
print(f"Pure distilled water (0% salt): {simulate_osmosis(0.0)}")
print(f"Medical IV saline (0.9% salt): {simulate_osmosis(0.9)}")
# This explains why saline drips are used in hospitals instead of pure water.
</syntaxhighlight>

; Critical Cellular Processes
: '''Active Transport''' → Using energy to pump molecules ''against'' their concentration gradient (e.g., the Sodium-Potassium pump).
: '''Apoptosis''' → "Programmed cell death." Essential for removing damaged or unnecessary cells (like the webbing between fingers in a fetus).
: '''Cell Signaling''' → How cells "talk" to each other using chemical signals (hormones, neurotransmitters).
: '''The Cell Cycle''' → The regulated series of events (Interphase, Mitosis) that lead to cell division.
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