Q:

How do nematodes move?

A:

Nematodes move through the contraction of their longitudinal muscles. There is high internal body pressure when these muscles contract, which causes the body of the nematode to flex instead of flatten. The thrashing caused by this back and forth movement propels a nematode forward.

Nematodes have no cilia or flagellae to help with their movement, according to the University of Michigan Museum of Zoology.

During the fertilization process, a male nematode uses copulative spines to open the female's reproductive tracts to inject sperm into them. Nematode sperm also doesn't have any flagellae present and therefore, they move using pseudopodia in the same way as amoebas. Nematodes, or round worms as they are commonly called, are simple worm-like organisms that are highly abundant in the environment. There are over 12,000 described distinct species of nematodes with some types occurring widely in many different environments, while others are specialized to one particular habitat.

The nematodes play a critical role as decomposers and predators of many microorganisms in the environmental ecosystem. However, nematodes can also infect humans both directly or indirectly through contact with domestic animals. Common species that infect humans include pinworms, hookworms and trichina, which is the parasite that causes trichinosis.


Is this answer helpful?

Similar Questions

  • Q:

    Why do testicles move?

    A:

    Testicles lift and descend in response to the contraction and relaxation of the cremaster muscle. Testicles rest gently inside this thin, pouch-shaped muscle, which draws them toward or away from the body as a way of regulating their temperature. The Mayo Clinic lists several factors, apart from temperature, that can trigger the retraction of the testicles. These include stimulation of the genitofemoral nerve and extreme emotions such as anxiety.

    Full Answer >
    Filed Under:
  • Q:

    How do annelids move?

    A:

    There are two sets of muscles that help annelids move. One expands, and the other contracts the body. Annelids alternate the use of these muscles to achieve locomotion.

    Full Answer >
    Filed Under:
  • Q:

    How do mammals move?

    A:

    Mammals move by using contractile muscles that pull against attachment points in their rigid internal skeletons, causing the bones to change orientation relative to each other around specific joints. This muscle contraction directly affects the movement, as the muscle pulls in a linear fashion in the direction the mammal wants the bones to move. This method of motion is shared by all vertebrates with internal skeletons.

    Full Answer >
    Filed Under:
  • Q:

    How do sharks move?

    A:

    Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.

    Full Answer >
    Filed Under:

Explore