✔ 最佳答案
The people knew that the silkworm meets the spinning to spin a cocoon, but how is the silk makes, not necessarily completely is actually clear. Originally in the silkworm larva's body, some set of structures are complete, the structure complex named silk gland makes the silk system. The silk gland connects under the forehead to be called the extrusion to spit the trychocyst, is composed a natural spinner old ripe larva by these two basic parts in the body, two rows cells compose the silk gland, it must compared to body length of body 5 times, and with stores the silk fluid the baggy pouch to be interlinked. On extrusion is connecting with the periphery muscle, when silkworm spinning, on muscle does not stop expands and contracts, pulls out the silk gland's in silk fluid presses, after silk fluid and air contact, then forms the tall and slender silk. When the silkworm spinning spins a cocoon, its head always from time to time raises, from time to time dangles, does not stop about the place to swing. If observes carefully with the magnifying glass, the silkworm makes the cocoon the silk, is one all arranges the very much neat glyph silk to encircle, every more than 20 bobbins are called a silk row. After cocoon weaves, it will come 1800 shallowturn, will start to weave the cocoon another head, therefore, the bombyx mori cocoon will be two hairs is thick, middle slightly thin, will look like a peanut very much. A silkworm each knot cocoon, needs to transform 2,501,500 times the position, weaves the approximately 60,000 glyph silk to encircle, each silk encircles approximately has 0.72 centimeter to be long. The silkworm is this does not stop weaves weaves, pulls out completely after in vivo's silk completely, only then the pupation changes E, the vaccination transfer of generation, benefitted for generations for the humanity.