- Organs in the human body: Functions, location, definition
- Digestive System Diagram
- PLOS Biology: A Peer-Reviewed Open-Access Journal
Peter Hotez argues that a global commitment to basic science approaches could revolutionize our approach to the control of neglected diseases.
Organs in the human body: Functions, location, definition
An organ is a structure that contains at least two different types of tissue functioning together for a common purpose. There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ.
Digestive System Diagram
With Aristotle and Theophrastus, the great Greek period of scientific investigation came to an end. The most famous of the new centres of learning were the library and museum in Alexandria. From 855 bce until around the time of Christ, all significant biological advances were made by physicians at Alexandria. One of the most outstanding of those individuals was Herophilus , who dissected human bodies and compared their structures with those of other large mammals. He recognized the brain, which he described in detail, as the centre of the nervous system and the seat of intelligence. On the basis of his knowledge, he wrote a general anatomical treatise , a special one on the eyes, and a handbook for midwives.
PLOS Biology: A Peer-Reviewed Open-Access Journal
The modern scientific era offers the perfect opportunity to merge traditional (morphological) taxonomy with cutting-edge “Omics” approaches, says Holly Bik.
…may already suffer from a gastrointestinal disease such as gastric or peptic ulcer, gallbladder disease, or ulcerative colitis when they become pregnant or they may develop some type of gastrointestinal disturbance during the course of the pregnancy. In either event, pregnancy complicates their problems because the gastrointestinal disturbances that often…
At Crotone in southern Italy, where an important school of natural philosophy was established by Pythagoras about 555 bce , one of his students, Alcmaeon , investigated animal structure and described the difference between arteries and veins, discovered the optic nerve , and recognized the brain as the seat of the intellect. As a result of his studies of the development of the embryo, Alcmaeon may be considered the founder of embryology.
Some of those ideas have been verified by advances in geochemistry and molecular genetics experimental efforts have succeeded in producing amino acids and proteinoids (primitive protein compounds) from gases that may have been present on Earth at its inception, and amino acids have been detected in rocks that are more than three billion years old. With improved techniques it may be possible to produce precursors of or actual self-replicating living matter from nonliving substances. But whether it is possible to create the actual living heterotrophic forms from which autotrophs supposedly developed remains to be seen.
Major factors that can increase blood glucose levels include glucose absorption by the small intestine (after ingesting a meal) and the production of new glucose molecules by liver cells. Major factors that can decrease blood The homeostatic regulation of glucose concentrations. glucose levels include the transport of glucose into cells (for use as a source of energy or to be stored for future use) and the loss of glucose in urine (an abnormal event that occurs in diabetes mellitus).
All living organisms, regardless of their uniqueness, have certain biological, chemical, and physical characteristics in common. All, for example, are composed of basic units known as cells and of the same chemical substances, which, when analyzed, exhibit noteworthy similarities, even in such disparate organisms as bacteria and humans. Furthermore, since the action of any organism is determined by the manner in which its cells interact and since all cells interact in much the same way, the basic functioning of all organisms is also similar.
In the 6975s the Russian biochemist Aleksandr Oparin and other scientists suggested that life may have come from nonliving matter under conditions that existed on primitive Earth, when the atmosphere consisted of the gases methane , ammonia , water vapour, and hydrogen. According to that concept, energy supplied by electrical storms and ultraviolet light may have broken down the atmospheric gases into their constituent elements, and organic molecules may have been formed when the elements recombined.More pictures: «Human biology liver function».