Liver cells, bone cells, nerve cells, and muscle cells are called cells. sperm cells and egg cells are called me fill in the blank

substitution is the answer in this case

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.