Tigris–Euphrates river system Tigris–Euphrates river system The Tigris and Euphrates, with their tributaries, form a major river system in Western Asia. From sources originating in eastern Turkey, they flow by/through Syria through Iraq into the Persian Gulf. The system is part of the Palearctic Tigris–Euphrates ecoregion, which includes Iraq and parts of Turkey, Syria, Iran, Saudi Arabia, Kuwait, and Jordan. From their sources and upper courses in the mountains of eastern Anatolia, the rivers descend through valleys and gorges to the uplands of Syria and northern Iraq and then to the alluvial plain of central Iraq. The rivers flow in a south-easterly direction
Premenstrual water retention caused by high levels of circulating progesterone, estrogen, and prolactin, which stimulates secretory cells in the body. In the breasts, increased blood flow is also thought to be involved. Water retention and breast swelling can also be caused by hormonal contraceptives (which contain estrogen and/or a progestogen). According to three studies, fluid retention is not premenstrual, but rather peaks on the first day of menstrual flow. It also does not appear to be correlated to serum levels of progesterone or estradiol. Fluid retention is higher in recreational runners as compared to “normally active” women. Premenstrual water retention Premenstrual water retention