Endocrine System
1 Bones, cartilage, and ligaments make up the skeletal system. 2  The skeleton supports the body against the pull of gravity. 3  The skeleton provides a framework that supports and protects the soft organs of the body. 4  Bones work together with muscles to move the body. 5  Blood cells are mostly made inside the bone marrow. Functions of Bones Your skeletal system gives shape and form to your body, but it is also important in maintaining homeostasis. The main functions of the skeletal system include: Support. The skeleton supports the body against the pull of gravity, meaning you don't fall over when you stand up. The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it. Oxygen-rich blood leaves the left side of the heart and enters the biggest artery, called the aorta. The muscular system is made up of tissues that work with the skeletal system to control movement of the body. Some muscles—like the ones in your arms and legs—are voluntary, meaning that you decide when to move them. Other muscles, like the ones in your stomach, heart, intestines and other organs, are involuntary. One of the most important systems in your body, the nervous system is your body's control system. It sends, receives, and processes nerve impulses throughout the body. These nerve impulses tell your muscles and organs what to do and how to respond to the environment. The muscular system is made up of tissues that work with the skeletal system to control movement of the body. Some muscles—like the ones in your arms and legs—are voluntary, meaning that you decide when to move them. Other muscles, like the ones in your stomach, heart, intestines and other organs, are involuntary. The nervous system is really complicated, but it can be divided into two really general parts. One is the Central Nervous System (or CNS). The CNS consists of your brain and spinal cord. The brain and spinal cord are inside your skull and vertebrae (the vertebrae make up your backbone). These bones protect the CNS when you get into accidents. The other part of the nervous system is the Peripheral Nervous System (or PNS). The PNS consists mainly of the nerves that go to and from the CNS. The heart and circulatory system make up your cardiovascular system. Your heart works as a pump that pushes blood to the organs, tissues, and cells of your body. Blood delivers oxygen and nutrients to every cell and removes the carbon dioxide and waste products made by those cells. The one-way system carries blood to all parts of your body. This process of blood flow within your body is called circulation. Arteries carry oxygen-rich blood away from your heart, and veins carry oxygen-poor blood back to your heart. In pulmonary circulation, though, the roles are switched Endocrine System. The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. Hormones are chemicals that control body functions, such as metabolism, growth, and sexual development. The muscular system is made up of tissues that work with the skeletal system to control movement of the body. Some muscles—like the ones in your arms and legs—are voluntary, meaning that you decide when to move them. Other muscles, like the ones in your stomach, heart, intestines and other organs, are involuntary. Body systems. Our bodies consist of a number of biological systems that carry out specific functions necessary for everyday living. The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide, and hormones, around the body. It consists of the heart, blood, blood vessels,arteries and veins.  Fat is one of the basic components that make up the structure of your body. The other components include muscle, water, bone and your organs — the brain, liver, kidneys, spleen, stomach, pancreas, and intestines. It is stored in small amounts in your bone marrow, organs, central nervous system and muscles. In men, essential fat is approximately 3% of body weight. Women, however, have a higher percentage of essential fat — about 12%.
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what is the system that makes up your body