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When there is contact between a tentacle and human skin, the stinging cells are activated and deploy their needles. Each needle penetrates the skin and injects its venom, generating pain, red marks and rashes. 
A. Stimulants from the skin initiate the discharge process
B. High internal pressure of 200 atmospheres is built in the capsule
C. With 40,000xG of acceleration the needle drills a hole into the skin
D. A tubule follows the shaft and injects the venom into the body