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Regulation! When your body gets excessively hot, from maybe external heat or exercise, your body produces and excretes sweat which helps keep body temperature at homeostasis by helping to release heat. Homeostasis is your body's state of equilibrium or balance. This can also be seen in processes like diffusion or osmosis where water moves across a membrane to reach equilibrium or homeostasis. Homeostasis can also be demonstrated in your sugar levels. When glucose or sugar levels get excessively high, the pancreas (in your endocrine system) releases a hormone known as insulin. If blood glucose levels drop too low, the liver converts glycogen in the blood to glucose again, increasing the levels. Regulation in your body can be conducted by the endocrine system, the excretory system, the immune system, or even your digestive system. Your excretory system regulates the waste produced in your body and excretes or releases it. Your immune system is tasked with fighting off diseases and viruses. And finally, your digestive system absorbs and uses the nutrients from the food you eat. Each of these systems can regulate your body in various ways, although the primary system in charge of regulation is your endocrine system. Your endocrine is composed of a complex network of glands, controlled by your pancreas to create, store and release hormones. Now let's talk birds and the bees, reproduction! It all starts with your reproductive system. This system is compromised of the penis, testicles, Epididymis, Vas deferens, and other accessory glands including the prostate gland and seminal vesicles in the male body. In the female body, your reproductive system is made up of the vagina, uterus, ovaries, fallopian tubes, and womb. This system controls actions like ejaculation to fertilization which creates life. Of course, it is far more complex than that, but that conversation requires its video alone. The reproductive system doesn't work with many other systems other than the endocrine system, since hormones are very important in reproduction. With that out of the way, let's talk defense, primarily your immune system. It is made up of white blood cells, antibodies, complement system, lymphatic system, spleen, bone marrow, thymus. Immune cells are made inside your bone marrow and from there also multiply. White blood cells are the primary factors in your immune system. They move through your blood and tissue throughout the body and launch an "immune attack" when they find invaders such as viruses, infections, or bacteria. Antibodies are a protective protein produced by the immune system in response to the presence of a foreign substance. Next, nutrient absorption. The body of this operation is your digestive system, which you have probably heard of. This system is compromised of your mouth, esophagus, stomach, pancreas, intestines, liver, rectum, anus, and gallbladder. The food you consume goes through your mouth where your saliva and teeth break down the food, down your esophagus, and into your stomach where stomach acids break down your food more into something that can be sent into your small intestine. The muscles of the small intestine mix food with digestive juices from the pancreas, liver, and intestine, and push the mixture forward for further digestion. Your body has consumed the nutrients from this point and the waste moves to your large intestine where it is changed from liquid to stool, and out of your anus during a bowel movement. That was a lot, wasn't it? No worries, I'm all done now, but let's summarize! Your endocrine system primarily regulates your bodily functions by creating and transporting hormones. Your reproductive system creates sperm and fertilizes that sperm to create a child that is held in a woman's womb. Your immune system uses antibodies, white blood cells, and more to fight off diseases, viruses, and others to protect your body. Lastly, your digestive system moves food throughout your body, absorbing nutrients that your body needs!