Insect Traps: Active traps can move, passive traps cannot. The lamina is tubular rather than flat, and it secretes a watery digestive fluid. The "throat" of the pitcher contains numerous trichomes that point toward the liquid. Some have upper surfaces covered in glandular trichomes that secrete a sticky liquid, and after an insect is caught the other adjacent trichomes are stimulated to bend toward the victim. Venus flytraps has turgid and swollen motor cells along the upper side of the midrib. If an insect brushes two of the trigger hairs, the midrib motor cells lose water quickly, and the trap rapidly closes. After the absorption is complete, the motor cells fill with water, swell, and force the trap open.