It also prepares your body for pregnancy each month. A cycle is counted from the first day of 1 period to the first day of the next period. The average menstrual cycle is 28 days long. Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.
Term. Describe the structural and functional relationships between the nephron tubules and their associated blood vessels. Definition. Portions of the nephron that extend from the renal corpuscle to the collecting duct allow exchange between the tubule and the peritubular capillaries.The epithelial cells in different segments are structurally different. For example, the membranes have different permeabilities and contain different transporters.ortions of the nephron that extend from the renal corpuscle to the collecting duct allow exchange between the tubule and the peritubular capillaries. The epithelial cells in different segments are structurally different. For example, the membranes have different permeabilities and contain different transporters.
Instructions. 1  Lymphatic System The lymphatic system comprises a network of lymphatic vessels, lymph nodes, and several other organs, distributed throughout the body as a network. 2  These structures collect fluid called lymph from the body and return it to the blood stream, thus maintaining the bodyâs fluid balance.he lymphatic system, on the other hand, is an organ system that functions through lymphatic vessels and structures. Furthermore, the lymphatic system is associated with the circulatory system, whereas the immune system is connected to the nervous system as well as the endocrine system.