Physiology

Oil painting depicting Claude Bernard, the father of modern physiology, with his pupils

Physiology (/ˌfɪziˈɒləi/; from Ancient Greek φύσις (physis), meaning "nature, origin", and -λογία (-logia), meaning "study of"[1]) is the scientific study of the normal function in living systems.[2] A sub-discipline of biology, its focus is in how organisms, organ systems, organs, cells, and biomolecules carry out the chemical or physical functions that exist in a living system.[3] Given the size of the field, it is divided into, among others, animal physiology (including that of humans), plant physiology, cellular physiology, microbial physiology (microbial metabolism), bacterial physiology, and viral physiology.[3] The Nobel Prize in Physiology or Medicine is awarded to those who make significant achievements in this discipline by the Royal Swedish Academy of Sciences. In medicine, a physiologic state is one occurring from normal body function, rather than pathologically, which is centered on the abnormalities that occur in animal diseases, including humans.[4]

History

Physiological studies date back to ancient civilizations of India[5][6] and Egypt alongside anatomical studies, but did not utilize dissection or vivisection.[7]

The study of human physiology as a medical field dates back to at least 420 BC to the time of Hippocrates, also known as the "father of medicine."[8] Hippocrates incorporated his belief system called the theory of humours, which consisted of four basic substance: earth, water, air and fire. Each substance is known for having a corresponding humour: black bile, phlegm, blood and yellow bile, respectively. Hippocrates also noted some emotional connections to the four humours, which Claudis Galenus would later expand on. The critical thinking of Aristotle and his emphasis on the relationship between structure and function marked the beginning of physiology in Ancient Greece. Like Hippocrates, Aristotle took to the humoral theory of disease, which also consisted of four primary qualities in life: hot, cold, wet and dry.[9] Claudius Galenus (c. ~130–200 AD), known as Galen of Pergamum, was the first to use experiments to probe the functions of the body. Unlike Hippocrates though, Galen argued that humoral imbalances can be located in specific organs, including the entire body.[10] His modification of this theory better equipped doctors to make more precise diagnoses. Galen also played off of Hippocrates idea that emotions were also tied to the humours, and added the notion of temperaments: sanguine corresponds with blood; phlegmatic is tied to phlegm; yellow bile is connected to choleric; and black bile corresponds with melancholy. Galen also saw the human body consisting of three connected systems: the brain and nerves, which are responsible for thoughts and sensations; the heart and arteries, which give life; and the liver and veins, which can be attributed to nutrition and growth.[10] Galen was also the founder of experimental physiology.[11] And for the next 1,400 years, Galenic physiology was a powerful and influential tool in medicine.[10]

Jean Fernel (1497–1558), a French physician, introduced the term "physiology".[12]

In 1858, Joseph Lister studied the cause of blood coagulation and inflammation that resulted after previous injuries and surgical wounds. He later discovered and implemented antiseptics in the operating room, and as a result decreases death rate from surgery by a substantial amount.[4][13]

In 1891, Ivan Pavlov performed research on "conditional reflexes" that involved dogs' saliva production in response to a plethora of sounds and visual stimuli.[13]

In the 19th century, physiological knowledge began to accumulate at a rapid rate, in particular with the 1838 appearance of the Cell theory of Matthias Schleiden and Theodor Schwann. It radically stated that organisms are made up of units called cells. Claude Bernard's (1813–1878) further discoveries ultimately led to his concept of milieu interieur (internal environment), which would later be taken up and championed as "homeostasis" by American physiologist Walter B. Cannon in 1929. By homeostasis, Cannon meant "the maintenance of steady states in the body and the physiological processes through which they are regulated."[14] In other words, the body's ability to regulate its internal environment. It should be noted that, William Beaumont was the first American to utilize the practical application of physiology.

The Physiological Society was founded in London in 1876 as a dining club The American Physiological Society (APS) is a nonprofit devoted to fostering education, scientific research, and dissemination of information in the physiological sciences. The Society was founded in 1887 with 28 members.

In the 20th century, biologists became interested in how organisms other than human beings function, eventually spawning the fields of comparative physiology and ecophysiology.[15] Major figures in these fields include Knut Schmidt-Nielsen and George Bartholomew. Most recently, evolutionary physiology has become a distinct subdiscipline.[16]

In 1920, August Krogh won the Nobel Prize for discovering how, in capillaries, blood flow is regulated.[13]

In 1954, Andrew Huxley and Hugh Huxley, alongside their research team, discovered the sliding filaments in skeletal muscle, known today as the sliding filament theory.[13]

Women in physiology

Initially, women were largely excluded from official involvement in any physiological society. The American Physiological Society, for example, was founded in 1887 and included only men in its ranks. In 1902, the American Physiological Society elected Ida Hyde as the first female member of the society. Hyde, a representative of the American Association of University Women and a global advocate for gender equality in education,[17] attempted to promote gender equality in every aspect of science and medicine.

Soon thereafter, in 1913, J.S. Haldane proposed that women be allowed to formally join The Physiological Society, which had been founded in 1876. On 3 July 1915, six women were officially admitted: Florence Buchanan, Winifred Cullis, Ruth C. Skelton, Sarah C. M. Sowton, Constance Leetham Terry, and Enid M. Tribe.[18] The centenary of the election of women was celebrated in 2015 with the publication of a book "Women physiologists: centenary celebrations and beyond for The Physiological Society ISBN 978-0-9933410-0-7.

Prominent women physiologists include:

Subdisciplines

There are many ways to categorize the subdiscplines of physiology:[27]

Human physiology

Human physiology seeks to understand the mechanisms that work to keep the human body alive and functioning,[3] through scientific enquiry into the nature of mechanical, physical, and biochemical functions of humans, their organs, and the cells of which they are composed. The principal level of focus of physiology is at the level of organs and systems within systems. The endocrine and nervous systems play major roles in the reception and transmission of signals that integrate function in animals. Homeostasis is a major aspect with regard to such interactions within plants as well as animals. The biological basis of the study of physiology, integration refers to the overlap of many functions of the systems of the human body, as well as its accompanied form. It is achieved through communication that occurs in a variety of ways, both electrical and chemical.

Much of the foundation of knowledge in human physiology was provided by animal experimentation. Physiology is the study of function and is closely related to anatomy which is the study of form and structure. Due to the frequent connection between form and function, physiology and anatomy are intrinsically linked and are studied in tandem as part of a medical curriculum.[28]

See also

References

  1. "physiology". Online Etymology Dictionary.
  2. Prosser, C. Ladd (1991). Comparative Animal Physiology, Environmental and Metabolic Animal Physiology (4th ed.). Hoboken, NJ: Wiley-Liss. pp. 1–12. ISBN 0-471-85767-X.
  3. 1 2 3 Hall, John (2011). Guyton and Hall textbook of medical physiology (12th ed.). Philadelphia, Pa.: Saunders/Elsevier. p. 3. ISBN 978-1-4160-4574-8.
  4. 1 2 "What is physiology?". Medical News Today.
  5. D. P. Burma; Maharani Chakravorty. From Physiology and Chemistry to Biochemistry. Pearson Education. p. 8.
  6. Francis Zimmermann. The Jungle and the Aroma of Meats: An Ecological Theme in Hindu Medicine. Motilal Banarsidass publications. p. 159.
  7. "Medicine Across Cultures". google.com.
  8. "Physiology". Science Clarified. Advameg, Inc. Retrieved 2010-08-29.
  9. "Early Medicine and Physiology". ship.edu.
  10. 1 2 3 "Galen of Pergamum". Encyclopedia Britannica.
  11. Fell, C.; Pearson, F. (November 2007). "Historical Perspectives of Thoracic Anatomy". Thoracic Surgery Clinics. 17 (4): 443–8. doi:10.1016/j.thorsurg.2006.12.001.
  12. Wilbur Applebaum. Encyclopedia of the Scientific Revolution: From Copernicus to Newton. Routledge. p. 344.
  13. 1 2 3 4 "Milestones in Physiology (1822-2013)" (PDF). 1 October 2013. Retrieved 2015-07-25.
  14. Brown Theodore M.; Fee Elizabeth (October 2002). "Walter Bradford Cannon: Pioneer Physiologist of Human Emotions". American Journal of Public Health. 92 (10): 1594–1595. doi:10.2105/ajph.92.10.1594. PMC 1447286Freely accessible.
  15. Feder, ME; Bennett, AF; WW, Burggren; Huey, RB (1987). New directions in ecological physiology. New York: Cambridge University Press. ISBN 978-0-521-34938-3.
  16. Garland, Jr, Theodore; Carter, P. A. (1994). "Evolutionary physiology" (PDF). Annual Review of Physiology. 56 (1): 579–621. doi:10.1146/annurev.ph.56.030194.003051. PMID 8010752.
  17. "Ida Henrietta Hyde". jwa.org.
  18. "Women in Physiology". physoc.org.
  19. "Carl Cori and Gerty Cori". Encyclopedia Britannica.
  20. "Cori cycle". TheFreeDictionary.com.
  21. "Facts on the Nobel Prizes in Physiology and Medicine". nobelprize.org. Nobel Media AB. Retrieved 2016-09-23.
  22. "Gertrude B. Elion". Encyclopedia Britannica.
  23. "The Nobel Prize in Physiology or Medicine 2004". nobelprize.org.
  24. "Francoise Barre-Sinoussi - biography - French virologist". Encyclopedia Britannica.
  25. "Elizabeth H. Blackburn". Encyclopedia Britannica.
  26. "Carol W. Greider". Encyclopedia Britannica.
  27. Moyes, C.D., Schulte, P.M. Principles of Animal Physiology, second edition. Pearson/Benjamin Cummings. Boston, MA, 2008.
  28. Bergman, Esther M; de Bruin, Anique BH; Herrler, Andreas; Verheijen, Inge WH; Scherpbier, Albert JJA; van der Vleuten, Cees PM (19 November 2013). "Students' perceptions of anatomy across the undergraduate problem-based learning medical curriculum: a phenomenographical study". US National Library of Medicine. National Institutes of Health. doi:10.1186/1472-6920-13-152. Retrieved 12 August 2016. Together with physiology and biochemistry, anatomy is one of the basic sciences that are to be taught in the medical curriculum.

External links

Look up physiology in Wiktionary, the free dictionary.
Wikisource has original works on the topic: Physiology

Bibliography

Human physiology
Animal physiology
Plant physiology
Fungal physiology
Protistan physiology
Algal physiology
Bacterial physiology
This article is issued from Wikipedia - version of the 12/2/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.