<Li> The human lymphatic system is constantly moving excess fluids, lipids, and immune system related products around the body . The lymph fluid has been found to move through a lymph capillary of the skin at approximately 0.0000097 m / s . </Li> <P> The cells of the human body have many structures which move throughout them . </P> <Ul> <Li> Cytoplasmic streaming is a way which cells move molecular substances throughout the cytoplasm . </Li> <Li> Various motor proteins work as molecular motors within a cell and move along the surface of various cellular substrates such as microtubules . Motor proteins are typically powered by the hydrolysis of adenosine triphosphate (ATP), and convert chemical energy into mechanical work . Vesicles propelled by motor proteins have been found to have a velocity of approximately 0.00000152 m / s . </Li> </Ul> <Li> Cytoplasmic streaming is a way which cells move molecular substances throughout the cytoplasm . </Li>

When do we say an object is in motion