Final answer:
The receptor that assists in the active secretion of aqueous humor is the ATP-binding cassette transporter (ABCA4), which moves ions across the nonpigmented ciliary epithelium (NPCE) of the eye.
Step-by-step explanation:
The receptor that assists in the active secretion of aqueous humor in the eye is called the adenosine triphosphate (ATP)-binding cassette transporter (ABCA4). It is responsible for moving ions across the nonpigmented ciliary epithelium (NPCE) of the eye. Two ions that it moves across the NPCE are sodium (Na+) and chloride (Cl-).