Carbon dioxide and oxygen are molecules that can move freely across a plasma membrane. what determines the direction that carbon dioxide and oxygen molecules move?

What determines the movement is the room the molicules have to move. Hope this helps.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d