Awater molecule is lost when two glucose units come together to form a molecule of lactose. which type of reaction is involved in the formation of the lactose molecule?

When two monosaccharaides e.g. glucose  join together to form a disaccharide,  the resulting bond is known  as glycosidic bond and is formed through a condensation reaction where a water molecule is lost in the process.

The condensation reaction occurs when an alcohol group (OH) from a molecule  reacts with the anomeric carbon of a sugar. The anomeric carbon is the central carbon of a hemiacetal.  The OH group bonded to that carbon is  replaced by the O of the alcohol , and the H of the alcohol is  removed. Together they make water which is then released and lost.

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