Equilibrium in an animal cell would be disrupted most significantly by

a. placing it into an isotonic solution
b. modifying the number of carbohydrate molecules on its surface
c. removing the transport proteins
d. maintaining a constant temperature

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.