what is the function of hydra
Answers
Answer:
Tubular Body- secured by simple adhesive foot called basal disc
basal disc- gland cells secrete sticky fluid which allow adhesive properties:
mouth- at the end of the body surrounded by 1-12 thin mobile tentacles
cnida (tentacle)- have highly specialized stinging cells called cnidocytes
when alarmed or attacked, tentacles retract into small buds and body column itself can be retracted to a small sphere
cnidocyte- have specialized structures called nematocysts:
(miniature light builds with a coiled thread inside).
cnidocil- short trigger hair at outer narrow edge of the cnidocyte. Upon contact with prey, contents of nematocysts are discharged firing a dart-like thread containing neurotoxins.
neurotoxins- paralyze the pray
body layers- separated by mesoglea, a gel-like substance
epidermis- outer layer
gastrodermis- inner layer
— made up of Hydramacin, a bactericide which protect outer layer against infection
epidermis- respiration and excretion occur by diffusion through this
— hunt: bend over and attach themselves with their mouth and tentacles, then release the foot which provides the usual attachment (looping)
— can move 100 mm in a day
— move by amoeboid motion of their bases or by detaching from the substrate and floating away in the current
Explanation:
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Answer:
The major function of hydraulic oil is to provide energy transmission through the system. However, hydraulic oil is also responsible for lubrication, cooling, sealing and removing contamination and wear materials. All of these functions need to be considered when choosing an oil.
Explanation: