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🕸️ How does a spider spin silk?

You watch a spider drop from a leaf and follow liquid protein through glands, a changing duct, and spinnerets until it is a thread that can beat steel by weight.

lessons

~12 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Silk factories inside the spiderIdentify the glands, storage solution, and specialized silk types involved in production.Spiders make several protein fibers in specialized glands and store them as concentrated liquid dope.
Spinnerets turn dope into threadExplain how spinnerets, ducts, and drawing control extrusion.Adjustable spinnerets and a shaped duct coordinate flow, selection, and pulling to form thread.
The liquid becomes a solid fiberTrace the chemical and mechanical changes that solidify silk.pH, ions, water, confinement, shear, and extension guide the rapid liquid-to-solid transition.
A molecular composite makes a tough threadConnect protein structure with silk strength, stretch, and toughness.Ordered beta-sheet blocks and flexible regions form a hierarchical composite fiber.
Why silk can beat steel by weightInterpret strength-to-weight claims and connect them to web design and biomimicry.Low density, strong molecular architecture, extensibility, and web geometry make silk efficient under load.

Questions this course answers

What is silk dope?

Silk dope is the concentrated spidroin solution held in a gland before the spider processes it into fiber.

Match each part to its main role.

Spiders divide silk production among specialized glands, storage spaces, and spinnerets.

Put the spinning process in order.

The spider first makes the protein, transports it, changes its chemical environment, and draws it into a thread.

Why are spinnerets more like adjustable extrusion nozzles than a single hole?

Nozzle arrangement and movement help a spider produce structural, stretchy, sticky, or wrapping fibers as needed.

Which change helps trigger solidification in the spinning duct?

Acidity, ions, confinement, shear, and extension work together to turn soluble dope into fiber.

Match each process to its effect.

Several linked physical and chemical changes guide the liquid-to-solid transition.

Grounded in trusted sources

Andersson et al., Carbonic anhydrase generates CO2 and H+ that drive spider silk formation, PLOS Biology, https://doi.org/10.1371/journal.pbio.1001921
Andersson et al., Biomimetic spinning of artificial spider silk from a chimeric minispidroin, Nature Chemical Biology, https://doi.org/10.1038/nchembio.2269
Landreh et al., Liquid-liquid crystalline phase separation of spider silk proteins, Communications Chemistry, https://doi.org/10.1038/s42004-024-01357-2
Knight and Vollrath, Changes in element composition along the spinning duct in a Nephila spider, Naturwissenschaften, https://doi.org/10.1007/s001140100220
MIT News, How spider webs achieve their strength, https://news.mit.edu/2012/spider-web-strength-0202
Finnigan et al., The effect of terminal globular domains on recombinant mini-spidroins, Scientific Reports, https://doi.org/10.1038/s41598-020-67703-1

Every Wunder lesson is built from real, reputable sources — never invented.

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