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The Onychophora and Tardigrada share some arthropod-like characteristics.
Vesicle
A small fluid-filled bladder, sac, cyst, or vacuole within the body or a cell.
Plasma Membrane
The semi-permeable membrane surrounding the cytoplasm of a cell, which regulates the passage of substances in and out of the cell.
Membrane Receptor
A cell membrane-bound protein or protein complex that transduces signals from outside the cell to the cell's interior, initiating a cellular response.
Isotonic
A solution having the same osmotic pressure as some other solution, typically that of a cell or body fluid, which prevents net movement of water across membranes.
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