What is the function of a channel, where is it located, and what is it made of?

cell anatomy

The primary purpose of any channel of distribution is to bridge the gap between the producer of a product and the user of it, whether the parties are located in the same community or in different countries thousands of miles apart.

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.