Silk gland can secrete liquid bone protein, which is very delicate, tough and elastic. This kind of bone protein will harden into silk thread when it comes into contact with air, and layers of silk thread can be woven into a net.
Spider spinning principle: there are six kinds of glands in spider abdomen; This is called a spinneret. Various glands produce different types of spider silk. There is a spinneret at the top of the gland with thousands of small holes on it. The sprayed liquid condenses into spider silk with strong viscosity and high tension when it meets air.
It is said that 1000 spider silk is one tenth thinner than human hair after fusion. Spider silk consists of a fibroin. For a specific diameter, the tensile strength of spider silk is greater than that of steel.
Extended data:
Spider is the most abundant predatory natural enemy in terrestrial ecosystem, and its role in maintaining the stability of agro-forestry ecosystem can not be ignored. Body length 1 ~ 90 mm, the body is divided into chest (front) and abdomen (back), and the head and chest are covered with carapace and chest plate. There are two pairs of appendages in the head and chest. The first pair is pliers, with a forceps tooth and a poisonous gland opening at the tip of the forceps tooth.
The pincers in the orthopalatine suborder move back and forth, and the pincers move laterally in the opposite direction; The second pair is whisker limbs, which are in the form of feet in female spiders and immature male spiders, and are used to hold food and act as sensory organs; However, in male adult spiders, the terminal part of the whisker limb will swell and become the interface for transporting sperm.
Spiders mostly feed on insects, other spiders and multi-legged animals, and some spiders also feed on small animals. Jumping spiders have good eyesight and can dive at close range to catch prey within 30 cm.
References:
Baidu encyclopedia _ Spider