What is the pathway of air into the body? Which plays both a role in physical and chemical digestion?

teeth
saliva
gall bladder
villi

I'm not sure on this, but I would say saliva. Take this answer with a grain of salt though

Saliva

Explanation:

I just got 100% on Edg.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

enzyme speed up the reactions