Single-cell animals {protozoa}| {unicellular animal} (Protista) live in water. Protozoa have no cell walls or can have chitin cell walls. Protozoa can have specialized organelles, such as flagella, cilia, neurofibrils, vacuoles, and eyespots. Protozoa are motile. Protozoa require nutrients.
electrochemical
Protozoa have membrane ion channels and have membrane receptors for light, chemicals, and touch. They maintain electric-voltage differences across cell membranes, because salt and protein concentrations inside cells are different than outside.
Biological Sciences>Zoology>Kinds>Protozoa
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Date Modified: 2022.0224