The SARS-CoV-2 Virus Targets ACE-2 Receptors on the Epithelial Cells

The SARS-CoV-2 virus targets ACE-2 receptors on the epithelial cells that line the interior surfaces of the lungs. What is the normal function of these receptors?

A) The receptors are involved with the regulation of a peptide hormone that is involved in controlling blood pressure.
B) The receptors normally bind to a neurotransmitter that facilitates the opening of ion channels into the cell.
C) The receptors are involved in the relay of extracellular signals into the cell.
D) The receptors function as enzymes that stimulate the growth and division of epithelial cells.