Almost all worms possess two sets of muscles called longitudinal and circular ones. Roundworms have one set of muscles, however. This is the central nervous system. It is made up of interneurones and connected Ganglia. Many nematodes also have ocelli (or light-sensitive receptors), which allow them to sense the environment around. Although the nervous system of roundworms is complex, the skeletal system is relatively simple.
Roundworms move forward by stretching the muscles in their long and short sides. This allows them to glide across the soil while moving forward. These muscles are located in the back of the worm’s bodies and help to squeeze their front and back. These muscles are responsible for propulsion. These muscles help the worm move forward by stretching out their bodies and pushing themselves forward and backward.
The head of roundworms is shaped like a round cylinder with a mouth and an oesophagus. Food is pulled into the pharynx where it is crushed and moved into the gut. The excretory canals distribute nutrients throughout their bodies. Special cells, called rennette cell, are used to expel nitrogen wastes. Roundworms have three major parts to their bodies: their mouth with teeth and pharynx, as well as their stomodaeum.
An annelid worm with bristles and muscular flaps on its sides is called a polychaete. Fireworms, which have stinging bristles on their parapodiums, dig into the sand to move around. Their bristles can cause inflammation and pain to the skin of humans. For this reason, roundworms have a unique body shape compared to their animal cousins.
Roundworms are found in water sources and soil. In areas of poor sanitation and where human feces are used for fertilization, the eggs of these worms may accumulate. Children should avoid eating contaminated food, especially raw vegetables, and should always wash their hands thoroughly before eating or changing nappies. If they are at high risk of getting roundworms, they should take preventative medication.
The brain of annelids has two pairs nerve cells in the head. These cells direct waste fluids out of the body, which is important in maintaining their internal temperature. Polychaete annulars also have eyes that can distinguish between light and dark and can recognize shapes. In addition, the body of flatworms has a nervous system made up of a pair of nerve cords that run the length of the worm and a large ganglion of nerve cells at the anterior end. The brain also contains photosensory cells.
Unlike humans, worms have five hearts. The gizzard is located behind the prostomium and grinds the food it consumes. The intestine then breaks it down into usable chemicals. These chemicals are absorbed into the bloodstream, while the waste material passes out the anus and rectum. The result is worm poop, which is rich in nutrients.