Moving material in and out of a cell by normal diffusion is called

Osmosis

During passive transport, materials move by simple diffusion or by facilitated diffusion through the membrane, down their concentration gradient. water passes through the membrane in diffusion process is called Osmosis

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.