Meissner corpuscles respond best when the skin ________; Merkel discs are most active when ________.
◦ rubs against another object; something warm touches the skin
◦ is touched by something warm; the skin rubs against another object
◦ rubs against another object; an object puts steady pressure on the skin
◦ senses steady pressure from an object touching the skin; an object rubs against the skin