Why Do Spiders Curl Up When They Die?

The video explores the unique anatomy of spider legs, which rely on hydraulic pressure rather than muscles to extend. This adaptation allows spiders to maximize their flexor muscles for gripping and climbing. Upon death, spiders experience rigor mortis, leading to their characteristic curled leg position due to the lack of ATP and pressurized hemolymph. The video also highlights how spider leg mechanics inspire the design of lightweight and flexible robots.

How do spiders extend their legs if they lack extensor muscles?

• By using tendons

• By using extensor muscles

• By using flexor muscles

• By using hydraulic pressure

What is the primary evolutionary benefit of spiders not having extensor muscles?

• It allows for faster movement

• It makes their legs lighter

• It provides space for stronger flexor muscles

• It helps them conserve energy

What happens to a spider's legs when it dies?

• They extend fully

• They curl up tightly

• They become rigid and straight

• They fall off

Why do muscles require ATP to relax?

• ATP helps in the synthesis of muscle proteins

• ATP is needed to break down muscle fibers

• ATP interacts with calcium ions to relax muscles

• ATP provides the energy for muscle contraction

How are scientists using the concept of spider leg hydraulics?

• To develop new types of adhesives

• To create lightweight and flexible robotic joints

• To improve prosthetic limbs

• To design more efficient engines