The movement of fluids, and in a way, the start of circulation and digestion, evolved in single celled prokaryotes right after LUCA to distribute nutrients and remove waste. Eventually, as eukaryotic cells grew larger and more complex, simple diffusion was no longer sufficient to move materials efficiently inside the cell. Cytoplasmic streaming and cytoskeleton-guided transport evolved to distribute nutrients, organelles, and waste within large single cells and simple multicellular colonies. This internal flow within a cell predates true circulatory and digestive systems: a trait of complex animals that evolve hundreds of millions of years later.
Intracellular Flow and Nutrient Exchange
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Intracellular Flow and Nutrient Exchange
~1.2 Billion Years Ago (+/- 300 million)
Cytoplasmic streaming and vesicle transport
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Before animals evolved circulatory and digestive systems, cells first evolved internal flow to move materials around inside themselves.
Subject: Evolution.
The earliest version of circulation began inside the cell. As cells became larger and more complex, they could no longer rely on simple diffusion alone, so internal transport systems evolved to move nutrients, organelles, and waste. Long before bodies had blood vessels or guts, life was already solving the problem of internal distribution at the cellular level.
Flashcard.
What internal cell framework helps guide transport inside eukaryotic cells?.
Answer. Cytoskeleton.
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