Is silver tarnishes when it comes in contact with hydrogen sulfide in the air a physical property or chemical property.

It is a chemical property because the Silver’s chemical composition is altered when it tarnishes.

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.