- published: 06 May 2009
- views: 449803
In cell biology, phagocytosis (from Ancient Greek φαγεῖν (phagein) , meaning "to devour", κύτος, (kytos) , meaning "cell", and -osis, meaning "process") is the process by which a cell—often a phagocyte or a protist—engulfs a solid particle to form an internal vesicle known as a phagosome. Phagocytosis was first noted by Canadian physician William Osler, and later studied by Élie Metchnikoff.
Phagocytosis is a specific form of endocytosis involving the vascular internalization of solids such as bacteria by an organism, and is therefore distinct from other forms of endocytosis such as the vesicular internalization of various liquids (pinocytosis). Phagocytosis is involved in the acquisition of nutrients for some cells. The process is homologous to eating at the level of single-celled organisms; in multicellular animals, the process has been adapted to eliminate debris and pathogens, as opposed to taking in fuel for cellular processes, except in the case of the animal Trichoplax.
Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.
The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.
In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.
Thanks to McGraw Hill, you can watch and learn all about the process oh phagocytosis!
Neutrophil granulocytes represent around 60 percent of all white blood cells and are an essential part of the innate immune system. It was previously considered impossible to improve the innate immune system, which is partially why vaccines are focused on the adaptive / acquired immune system. Recent research tells us however, that beta glucans may improve the killing abilities of the innate immune system, and help neutrophils identify and move faster to the site of a foreign invader (chemotaxis) and devour the pathogens more effectively (phagocytosis). Research published 2011 in the journal Nature features new discoveries about how beta glucans prime the innate immune system to protect the body: http://www.facebook.com/notes/immiflex-immune-health-with-wellmune-wgp-beta-glucan/new-study-s...
Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-immune-system/rn-the-immune-system/v/types-of-immune-responses-innate-and-adaptive-humoral-vs-cell-mediated?utm_source=YT&utm;_medium=Desc&utm;_campaign=Nclex-rn Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/rn-lymphatic-system/rn-the-lymphatic-system/v/what-is-lymph?utm_source=YT&utm;_medium=Desc&utm;_campaign=Nclex-rn NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at http://creativecommons.or...
A brief discussion on Phagocytosis. Topics include: - Definition of Phagocytosis - Steps of Phagocytosis - Recognition and Attachment - Engulfment - Killing and Degradation - Intracellular Killing - Extracellular Killing - Role of Reactive Oxygen Species - Frustrated Phagocytosis - Defects of Phagocytosis - Chediak-Higashi Syndrome - Chronic Granulomatous Disease - MPO Deficiency
The topics covered in this video lecture are: Phagocytosis Phagocytes Mechanism of Phagocytosis Phagocytosis by Neutrophils
Phagocytosis Animation based on art from Chapter 23 of Slonczewski and Foster's Microbiology 2e
Phagocytosis in 5 easy steps! With pictures!