Tips. 1  If you want to focus on a particular muscle area, you can do so by changing the stride length. 2  For an elliptical with multiple users, use one whose stride length is adjustable to accommodate different heights. 3  Do not rely solely on guidelines.
3. Intercellular chemical signals secreted into the circulatory system; carried to organs they control, where they bind to receptors and produce a response. 4. Intercellular chemical signals, secreted by nerve cells; important in the function of the nervous system.
The Structure of the Endocrine System. The endocrine system is composed of the following endocrine glands; thyroid, parathyroid, pituitary, pineal and adrenal.The endocrine glands secrete hormones, which are messenger molecules, into the interstitial fluid in the bloodstream.These released hormones affect nearly every cell, organ, and function of the human body.or example, the endocrine system influences things like cell growth, whilst faster processes, like breathing are controlled by the nervous system. The nervous and endocrine systems are different systems, yet are complementary systems and work together to help the body function properly.