Endocytosis & Exocytosis

Run vesicle transport

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Cell process

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Live measurements

Cycle stageapproach
Vesicle rate0.00 /min
Cargo moved0 units

cargovesicleorganelle

Camera & microscopic focus

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Tap the membrane, nucleus, vesicle, receptor, endosome, lysosome, or Golgi apparatus.

Teacher demo tools

Vesicle history

Interactive teacher lecture

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What to watch

Start the lecture or choose a chapter. The named structure will be magnified automatically.

Teacher transcript

Each spoken structure is labelled with an arrow, magnified, and animated on the canvas.

Lesson chapters

Learning objectives

  • Compare endocytosis with exocytosis.
  • Distinguish phagocytosis, pinocytosis, and receptor-mediated uptake.
  • Trace cargo through coated vesicles, endosomes, and lysosomes.
  • Explain membrane fusion and calcium-triggered secretion.
  • Connect vesicle trafficking to membrane balance.

Key concepts

Endocytosis bends plasma membrane inward to form a cargo-containing vesicle. Exocytosis fuses an intracellular vesicle with the plasma membrane and releases cargo outside. Both require proteins, membrane remodeling, and energy.

Sizes, timing, and cargo numbers are conceptually scaled. The sequence and cause-and-effect relationships are scientifically grounded.

Suggested experiments

  1. Lower ATP and compare vesicle completion.
  2. Raise receptor density and observe selective uptake.
  3. Set calcium to zero during regulated exocytosis.
  4. Compare particle engulfment with fluid uptake.
  5. Click every organelle to inspect its microscopic action.

Applications and misconceptions

Immune cells engulf microbes, cells internalize cholesterol through receptors, neurons release neurotransmitters, and endocrine cells secrete hormones.

  • Endocytosis does not mean substances pass through a protein pore.
  • Exocytosis does not destroy the vesicle membrane; it joins the plasma membrane.
  • Receptor-mediated uptake is selective.
  • Vesicles are actively sorted and transported, not simply drifting bubbles.

Visual concept quiz

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