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#1: http://www.livescience.com/37009-human-body.html
#2: http://www.innerbody.com/
#3: https://kidskonnect.com/health/human-body/

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The digestive system is where the food or drinks you swallow move down your body and into a series of breaking it down into acid. This system contains the mouth, stomach, pyloric sphincter valve, the liver and a bunch of other organs. Now the process starts in the mouth when swallowing food. Swallowing pushes chewed food into the esophagus, where it passes through the oropharynx and hypopharynx. At this point, food takes the form of a small round mass and digestion becomes involuntary. A series of muscular transports food through the rest of the system. The esophagus empties into the stomach. The stomach’s juice starts breaking down proteins and killing potentially harmful bacteria. After an hour or two of this process, a thick semi-liquid paste, called chyme, forms. At this point the pyloric sphincter valve opens and chyme enters the duodenum, where it mixes with digestive enzymes from the pancreas and acidic bile from the gall bladder. The next stop for the chyme is the small intestine, a 20-foot tube-shaped organ, where the majority of the absorption of nutrients occurs. The nutrients move into the bloodstream and are transported to the liver. The liver creates glycogen from sugars and carbohydrates to give the body energy and converts dietary proteins into new proteins needed by the blood system. The liver also breaks down unwanted chemicals, such as alcohol, which is detoxified and passed from the body as waste.

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The nervous system is a complex group of cells that send signals to the brain when something occurs inside or on the outside of the human body. This usually happens if someone is cold and they get a chill, the cell transmits the signal to the brain telling it that the body is cold. From there, your brain tells your body to shiver and then that is what happens. The nervous system has two main subdivisions: the somatic, or voluntary, component; and the autonomic, or involuntary, component. The autonomic nervous system regulates certain body processes, such as blood pressure and the rate of breathing, that work without conscious effort. The somatic system consists of nerves that connect the brain and spinal cord with muscles and sensory receptors in the skin.

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The endocrine system is what helps human's growth, develops the hormones for us and also burns calories, fat, etc.  The hormones circulate throughout the body. Each type of hormone is targeted toward certain organs and tissues. The endocrine system is what determines at what height you grow until reaching the limit. Some people stop grown at 5'2 and some stop at 6'5. Lastly, the fat or calories you burn is up to the system. If you were running, the system would do its job reducing the amount of calories or fat you burn.

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The circulatory system is the system in which helps us take in oxygen and breathe out carbon dioxide. One of the main organs within the circulatory system is the lungs. Its also known as a "highway" for blood to travel within the body. The circulatory system sends oxygen-depleted blood away from the heart through the pulmonary artery to the lungs and returns oxygenated blood to the heart through the pulmonary veins.

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The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.Red blood cells collect the oxygen from the lungs and carry it to the parts of the body where it is needed. During the process, the red blood cells collect the carbon dioxide and transport it back to the lungs, where it leaves the body when we exhale.

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The skeletal system contains a series of bones that hold up the human body like pillar's holding a tower. There are 206 bones in an adult body. The skeletal system performs vital functions — support, movement, protection, blood cell production, calcium storage and endocrine regulation — that enables us to survive on our own.

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Within the Muscular system, there are muscles. These other muscles carry out different functions. These muscles are known as the cardiac muscle, the visceral muscle and the skeletal muscle. The body's muscular system consists of about 650 muscles that aid in movement, blood flow and other bodily functions. Visceral muscle is found inside of organs like the stomach, intestines, and blood vessels. The weakest of all muscle tissues, visceral muscle makes organs contract to move substances through the organ. The cardiac muscle is Found only in the heart. Cardiac muscle is responsible for pumping blood throughout the body. The last Muscle is the skeletal muscle and the Skeletal muscle cells form when many smaller cells lump themselves together to form long, straight fibers. Just like cardiac muscle, these skeletal muscle fibers are very strong.

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The Human Body: What systems do we have inside us?

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The Human Body: What systems do we have inside us?

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There are more than 5 systems that rest inside of our body. The systems contain of:  Muscular System, Skeletal System, Nervous System, Respiratory System, Circulatory System, Digestive System, and Endocrine System. Each system has their very own function. All the systems work together to keep the human body in a healthy matter.