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Scientists obtain a great deal of the evidence they use by observing natural ... The shift developed from the assumption that a scientific theory is a system of ... If observational evidence is objective in this sense , it can provide peopl

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.