The human body system is made up of several different systems with different functions. The main systems are the skeletal system, muscular system, nervous system, endocrine system, cardiovascular system, lymphatic and immune system, respiratory system, digestive system, urinary system, and the reproductive system. Each of these systems works together in harmony.
Each organ and structure in the body fits together to make a complex functioning whole. No other system is so complex or as advanced. The human body starts to develop these systems from the moment we are conceived at the fetal development stage. Our quickest growth period happens before we are born and by the time we enter the world all of these systems are perfectly formed. There are growth and development still to occur to aid our bodies defense systems but our life functions are already perfect.
Anatomy Of Human Body
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The anatomy of the human body has so many structures and inner workings it is really fascinating. It is surprising how little we actually know about our own bodies. Each organ and structure in the body fits together to make a complex functioning whole. No other system is so complex or as advanced. Here you will find information on each area of the body including common diseases and disorders and ways that they are treated. There are also recent articles on disease and advances in human body research. The site also illustrates major areas of the entire body from head to foot.
- The muscular system makes up nearly half the weight of the human body, this is why when we train we sometimes put on weight instead of losing it. We put on muscle weight.
- The nervous system is the bodies way of communicating. The brain and body are constantly alive with billions of electrical and chemical signals.
- The cardiovascular system is the heart and the bodies blood transporting network of arteries, veins, and vessels. The system carries oxygen and vital nutrients to all parts of the body and removes harmful waste products from tissues.
- The digestive system works to physically and chemically break down food. Food and fluids are processed by the digestive organs so that nutrients can be absorbed from the intestines and circulated around the body.
Human Nervous System Facts
What are some interesting facts about the nervous system?
The nervous system is one of the human body’s most complex systems!
Click on the picture for an interactive diagram
- This amazing system is a vast network of fibers which enables the brain to communicate with the body’s organs and systems
- Billions of electrical and chemical signals are transmitted around this network both to and from the brain.
- The system is split into central nerves and peripheral nerves.
- Together they form a network that spreads around the entire body.
- The central system is made up of the brain and spinal cord.
- The nerve fibers that branch out from the central nerves from the peripheral system.
- The peripheral nerves send information back to the central nerves for processing.
- Some nerves in the peripheral system are grouped together to keep close control over vital organs and functions.
Human Skeletal System
Interesting facts about the skeletal system
Our skeleton is tough and flexible. It supports weight and protects our internal organs. Bone tissue stores minerals, such as calcium, and it is constantly renewed, which is how our bones are able to heal.
Bones are cleverly designed to allow movement at the joints and provide great stability. The bones provide light but strong framework for the bodies of soft tissues.
The number of bones in the human body actually varies from person to person but the average number is 206.
There are two sections of the body, the central bones which include the skull, ribs, spine, and sternum. The arms, legs, shoulder blades, collar bone, and pelvis make up the appendicular skeleton.
Human Cardiovascular System
Why the cardiovascular system is the most important?
- The cardiovascular system is the body’s blood transporting network of arteries, veins, and vessels.
It is responsible for carrying oxygen and vital nutrients to all parts of the body and removes harmful waste products from tissues.
- The heart pumps blood through arteries and smaller vessels to all parts of the body.
- The blood returns to the heart through veins.
- The pulmonary arteries are the only arterial vessels that transport deoxygenated blood.
- Blood makes a full circuit of the body in about one minute.
- At the core of this system is the heart.
- It is about the size of a grapefruit and located to the left of the center chest.
- It needs a generous supply of oxygen which is supplied by the large supply of blood.
- Blood that flows through the heart cannot supply it with oxygen and nutrients – so it has its own network of blood vessels called the coronary system.
How does a human heart work?
This human heart diagram shows the most powerful muscle in the human body. It is made up of a special type of muscle called myocardium which occurs nowhere else in the body.
The heart has two sides:
- The left side takes in oxygenated blood from the lungs (via the pulmonary vein).
- The oxygenated blood enters the heart’s left atrium which contracts, pushing it through into the left ventricle, which pumps it out of the heart and around the body via the aorta (the main artery).
- The right side takes in deoxygenated blood from the body (via veins) and pumps it back to the lungs to be oxygenated again.
- The deoxygenated blood enters the heart’s right atrium which contracts, pushing it through into the right ventricle, which pumps it out of the heart and back to the lungs via the pulmonary artery.
- The left side of the heart has a much thicker walled ventricle, as this has to pump the blood around the body at high pressure.
- The high pressure in the arteries causes a pulse.
- The arteries narrow down into capillaries, which have very thin walls to enable oxygen and nutrients to seep out (in the form of tissue fluid) into the surrounding tissue.
- A strong muscular wall called the septum divides the two sides of the heart.
- Four one-way valves control blood flow through the heart chambers.
- The heart muscles have a separate network of blood vessels that supply it with oxygen, this is called the coronary system.
Human Digestive System
What does the human digestive system do?
- The digestive system works to physically and chemically break down food.
Food and fluids are processed by the digestive organs so that nutrients can be absorbed from the intestines and circulated around the body.
- The digestive process is mostly completed when food reaches the end of the small intestine.
- The digestive organs include the mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus.
- These organs together form a food-processing pipe that is 30 foot long!
- Salivary glands, the pancreas, the liver, and the gallbladder also play an important role in digestion.
- The appendix, a short, blind-ended tube attached to the large intestine has no known function.
- Food is moved through the digestive tract by muscular contractions.