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.Know More
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.Learn more about Zoology
Nematodes are a varied and ubiquitous group, but fall into the general types of predators, saprophages, plant parasites and animal parasites. Even these categories are problematic, however, since some species occupy one niche during their juvenile stages and another at adult stages. Nematodes are found in almost every environment on earth, but their small size and their habits make them rarely seen by humans.Full Answer >
Nematodes offer a natural alternative for eliminating grubs. Application time depends on the size of the lawn. Application requires a water hose and hose end sprayer. Nematodes are available online and from organic garden supply stores.Full Answer >
The scientific definition of plasmolysis is stated as the contraction of the protoplasm of cells within plants due to the loss of water through osmosis. It is when the cell membrane peels off of the cell wall and the vacuole collapses when placed in a hypertonic environment.Full Answer >
Systolic blood pressure measures the arterial blood pressure due to contraction of the heart, whereas diastolic blood pressure is a measure of arterial pressure between heart contractions, according to WebMD. A blood pressure cuff is used to make the measurements; systolic pressure is measured first, followed by the diastolic pressure. All blood pressure is measured in millimeters of mercury.Full Answer >