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Annelids 10B (Reproduction (Reproduce sexually and asexually., Some are…
Annelids 10B
Reproduction
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After fertilization, the young are protected in the cocoon to develop.
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Movement
- fluid in the coelom presses outward
- the earthworm contracts the longitudinal muscles that run the length of its body
- contracts circular muscles surrounding each segment
- segment shortens and returns to original shape
- annelids have setae (are tiny bristles that push into the soil and anchor the worm) in each segment
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Response to Stimuli
- anterior segments are modified for sensing the environments
- the brain and nerve cords are composed of ganglia
- can detect both light and vibrations
Feeding
Gizzard is a muscular sac containing hard particles that help grind soil and food before they pass into the intestine.
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