Which is a way in which exocytosis differs from the pumping of calcium ions against a concentration gradient?

A. Exocytosis is a form of passive transport.
B. Exocytosis does not involve a carrier protein.
C. Exocytosis occurs with the concentration gradient.
D. Exocytosis requires an expenditure of energy by the cell

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.