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 endocrine and nervous systems are two major systems involved in the control and regulation of body functions. The endocrine system consists of endocrine glands and endocrine cells in other organs (kidney, placenta, etc.) that secrete biologically active substances called.. In contrast to exocrine glands, which have secretory ducts, the endocrine glands are âductlessâ and secrete. into the blood.he endocrine system consists of endocrine glands and endocrine cells in other organs (kidney, placenta, etc.) that secrete biologically active substances called. . In contrast to exocrine glands, which have secretory ducts, the endocrine glands are âductlessâ and secrete.