Is formed by the union of the ductus deferens and the seminal vesicle?

Which type of stimulus do mechanoreceptors detect? sound pain heat light

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

Where is the nictitating membrane found? a. between the eyelid and the eyeball b. between the retina and the optic nerve c. between the outer and middle ear d. in the organ of corti in the middle ear