Learn about the major environmental problems facing our planet and what can be done about them! ![]() Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.The hypothalamus also controls endocrine functions such as the regulation of the thyroid gland and the secretion of stress hormones from the adrenal gland. Oxytocin, for instance, which is a hormone that controls uterine contraction during childbirth as well as lactation, is released from the periventricular cells of the hypothalamus in the brain. To give another example, the nervous system also exerts control over the reproductive system. This process essentially primes the body for feeding. However, even before food is physically ingested, the sight, smell, or even thought of food will trigger the brain to stimulate the GI tract to start releasing digestive juices and enzymes. When food particles enter the GI tract, the GI system will release enzymes and gastric juices to digest the food. For example, digestion is a complex process partially controlled by the nervous system. Nervous system control over the body includes not only voluntary control of limbs but also involuntary control over several critical physiological processes. ![]()
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