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5 kwi 2022 · Spiders increase haemolymph pressure in the fore body shortly before the first movement of a leg becomes visible. In this short moment before leg movement, the flexor muscles first resist, i.e. they contract with increased haemolymph pressure until the leg is to be extended.
Most of the spider’s leg joints are traversed by several mus-cles that function primarily as flexors or extensors. This can be compared to our arms, where the biceps serve as flexors and the triceps serve as extensors of the elbow joint.
16 gru 2014 · Spiders don't need extensor muscles because they can use fluid movement/hydraulics to "push" out their legs. The cephalothorax acts something like a very finely-tuned, fluid-filled bellows that pushes hemolymph around the body of the spider in a fraction of a second.
The cephalothorax is joined to the abdomen by a thin flexible pedicel. This allows a spider to move its abdomen in all directions, and thus, for example, to spin silk without moving the cephalothorax. This waist is actually the last segment (somite) of the cephalothorax (the pregenital somite).
16 lut 2019 · Smaller spiders (usually those weighing under 3g) use a hydraulic catapult method to move around and catch prey, whereas larger spiders (those weighing over 3g) rely on a combination of a hydraulic catapult and muscle-based contraction.
Spiders use hydrostatic pressure to extend their legs, but muscles to flex the legs. Spiders are able to control their heart rate to control hydrostatic pressure.
1 mar 2014 · Spiders have both fast- and slow-twitch muscles, although most spiders have more fast-twitch fibers than slow-twitch fibers in their legs . With the exception of innervation, muscle tissue varies little across the animal kingdom ( 11 ).
