Assertion: heart's muscle | /r/AtLocation | the inside of the exoskeleton
Facets:
value: to flex their limbs
type: PURPOSE
Source sentences:
text: Although all arthropods use muscles attached to the inside of the exoskeleton to flex their limbs, some still use hydraulic pressure to extend them, a system inherited from their pre-arthropod ancestors; for example, all spiders extend their legs hydraulically and can generate pressures up to eight times their resting level.