The body has many functions and processes

The body has many functions and processes. They are similar and different.
The six that will be discussed are the skeletal, circulatory, digestive, nervous, endocrine and respiratory systems. The systems in the human body are vital to our survival and well-being.
The skeletal systems is made up bones and joints. At birth humans have 270 bones. The number of bones decreases to 206 bones by adulthood since the bones fuse together. A bone is a living organ that is made up of many cells, protein fibers, and minerals. The five jobs the system is responsible for is supporting the body, storing minerals, producing blood cells, protecting organs and providing movement.
The skeleton is the frame of the human body which makes up about 30-40% of an adult’s body mass.
The circulatory system is also known as the cardiovascular system or the vascular system.The three major parts of the circulatory system are the heart, blood and blood vessels. The functions of the circulatory system is to transport blood and serum to all tissues and organs, nutrients including oxygen and glucose to cells, and waste products from the cells to the intestinal tract and kidneys.
The digestive system is made up of the gastrointestinal tract plus the organs of digestion which include the tongue, salivary glands, pancreas, liver, and gallbladder. The job of the digestive system is to break down food into smaller units called nutrients that will be converted to energy. The process starts at the mouth. Chewing and saliva starts to break down your food. After being chewed and swallowed, the food enters the esophagus. The esophagus is a long tube that runs from the mouth to the stomach. The stomach churns the food and bathes it in a very strong acid. After being in the stomach, food enters the duodenum, the first part of the small intestine. After passing through the small intestine, food passes into the large intestine. The food travels across the abdomen in the transverse colon, goes back down the other side of the body in the descending colon, and then through the sigmoid colon.
The nervous system is the master coordinating system of the body. The nervous system is made up of the nerve fibers that branch off from the spinal cord and extend to all parts of the body, including the neck and arms, torso, legs, skeletal muscles and internal organs. It consists of two main parts, the central nervous system and the peripheral nervous system. The nervous system is the most important system of the entire body as it controls and coordinates every other cell, tissue, muscle, gland, organ and system.
The endocrine system is is a chemical messenger system consisting of hormones. The main function of the endocrine system is to help regulate and maintain the various functions of the body by releasing hormones, which are often referred to as chemical messengers. These hormones are produced and secreted by what are known as endocrine glands. The major endocrine glands include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus, gastrointestinal tract and adrenal glands.
The respiratory system is is a biological system consisting of specific organs and structures used for the process of respiration in an organism.The main function of the respiratory system is the exchange of gases such as oxygen and carbon dioxide in the lungs. It includes the mouth, nasal cavity, lungs, bronchial tubes, diaphragm and trachea. Without this system we would be able breath or live.