Flatworms do not have hearts, blood vessels or lungs. 4. Nematodes Nematodes have a versatile body with no blood. They are microscopic worms that belong to the Phylum Nematoda which are often ...

The nematodes detect some compounds produced by ... for cancer because it takes time and costs money; they have to have a blood test or go into a machine,” says di Luccio.

Male and female nematodes then mate to produce microfilariae, which enter the blood stream and can be taken up by mosquitoes during a blood meal. Bennuru and Nutman observed that exposure to ...