External and internal structure of gastropods.

| December 20, 2020 | education

The external structure of gastropods.
– Sink. Most molluscs have a spirally wound shell, some are underdeveloped or completely absent. There is a mantle under the sink.
– Body. Consists of three sections: head, torso, leg.
– The head has one or two pairs of long tentacles and a pair of eyes.
The internal structure of gastropods.
1. Hydrostatic skeleton
2. Circulatory system: – two-chambered heart (ventricle, atrium)
3. Respiratory system: – gills or lungs
4. Nervous system: – nerve nodes (ganglion)
– statocysts – organs of balance in the form of a bubble, located in the leg
– the organs of smell (osphradia) are located in the mantle cavity
5. Digestive system: -mouth
-pharynx
-esophagus
-stomach
– middle, hind gut
-radula (muscular tongue with chitinous teeth
-liver
-anal hole
6. Excretory: -one or two kidneys
7. Sexual: -the sex gland is unpaired with one duct (snails have both male and female genitals)



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