(a) The passage outlines the endocrine system. Complete the passage by using the most appropriate scientific terms. The endocrine system consists of tissues and ______________, which secrete hormones such as insulin, glucagon and antidiuretic hormone (ADH). Glucagon only affects target cells that have complementary receptors, which are located on the ______________. Glucagon binds to these receptors and this leads to the production of a ______________, which transfers the signal throughout the cytoplasm. The target cells for insulin are in the liver, ______________ and adipose tissue. The target cells for ADH are those of the distal convoluted tubule and the ______________ of the kidney nephron. These hormones are involved in ______________, which is the maintenance of a constant internal environment. [Figure 9.1]