The Human Body
From the smallest unit - the cell - to all of the organ systems and their components we present The Human Body.
Complete with thousands of graphics and popups with those terms you may not know. You can get a true education by reading and understanding this compendium of articles.
The main concern of anatomy is to recognize the relationships, the connections between the individual components within the human body.
Medical professionals often refer to sections of the body in terms of anatomical planes (flat surfaces). These planes are imaginary lines – vertical or horizontal – drawn through an upright body. The terms are used to describe a specific body part.
The Human Cell
The human cell is the smallest structure capable of basic life processes, such as taking in nutrients, expelling waste, and reproducing. The human cell is a marvel of design and efficiency. Cells carry out thousands of biochemical reactions each minute and reproduce new cells that perpetuate life. Here's the inside scoop on the human cell.
The Cardiovascular System
The cardiovascular system is made up of the heart and all of the blood and lymphatic vessels in the body. The heart acts as a pump to drive the blood; a complex fluid made up of digested food materials, respiratory gasses (oxygen being carried in, carbon dioxide being carried out), and protective and regulatory chemicals through the approximately 60,000 miles of vessels in the body.
Find out how this amazing system works.
The Digestive System
The digestive tract, one of the largest of all body systems, extends approximately 30 feet long and extends as a long continuous tube, from mouth to anus! This system is unique in that it is strictly speaking "outside the body". That is, it's long continuous tube communicates with the outside world. The digestive system is 2nd in importance in terms of function to the master controlling system, the nervous system. These articles explain why.
The Endocrine System
The endocrine system carries out a wide variety of physiological processes through chemical messengers called "hormones." This system is a collection of glands that produces these hormones, which are necessary for normal bodily functions.
When functioning properly, the endocrine system is like a fine-tuned orchestra. Because the endocrine system is comprised of several organs, many functions can go awry. In this section we'll explain the intricacies of the endocrine system and just how you can "make it play" the music you want it to.
The Immune System
The immune system is a complex network of specialized cells and organs that has evolved to defend the body against attacks by "foreign" invaders. When functioning properly it fights off infections by agents such as bacteria, viruses, fungi, and parasites. When it malfunctions, however, it can unleash a torrent of diseases, from allergy to arthritis to cancer to AIDS.
Although we've included the mind as part of the body, you'll see it isn't part of the body but it can control the body. What has been a very confusing subject is clarified here.
How does your mind affect your body? or your behavior? And does it really contain the commands that kick in and control the way you think, act and feel without you knowing it?
The Nervous System
The nervous system of the human being is responsible for sending, receiving, and processing information by the way of nerve impulses throughout the body. All the organs and muscles inside your body rely upon these nerve impulses to function. It could be considered as the master control unit inside your body.
The Reproductive System
The ability to reproduce is one of the unifying characteristics of all living things. Sexual reproduction produces offspring that are genetically different from their parents.
We cover the reproductive system in full including the male and female reproductive systems as well as the topic of embryology.
The Respiratory System
The respiratory system for gaseous interchange, which consists of the upper respiratory tract and the lower respiratory tract. The upper and lower tracts consist of the mouth, nose, pharynx, and larynx and then in the lower trachea, bronchi, bronchioles, and alveoli.
We cover the respiratory system with these articles.
The End of Life - A Perspective
If asked how we would like to die, many of us would reply "from old age." Instead of suffering disease prior to death, we would like to remain reasonably healthy until one day our body stops working, preferably in our sleep. But does anyone really die of old age, or is there always an underlying disease?