Which term names the change in the environment that causes an organism to change its activity? a. brain b. parasite c. response d. stimulus

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.

life would be meaningless without memes