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This article contains a list of organs in the human body. It is widely believed that there are 79 organs (this number goes up if you count each bone and muscle as an organ on their own, which is becoming a more common practice [1] [2]); however, there is no universal standard definition of what constitutes an organ, and some tissue groups' status as one is debated. [3]
At maturity, there are roughly 30 trillion cells, and 38 trillion bacteria in the body, [3] [4] an estimate arrived at by totaling the cell numbers of all the organs of the body and cell types. The skin of the body is also host to billions of commensal organisms as well as immune cells. [5] Not all parts of the body are made from cells.
Weibel–Palade body – Ewald R. Weibel (1929–2019), Swiss biologist, and George Emil Palade (1912–2008), Romanian-American cell biologist; Wenckebach's bundle – Karel Frederik Wenckebach (1864–1940), Dutch anatomist; Wernicke's area – Karl Wernicke (1848–1905), German physician, anatomist, psychiatrist and neuropathologist
Human umbilical vein endothelial cells pictured down a microscope at 200x zoom. Human umbilical vein endothelial cells (HUVECs) are cells derived from the endothelium of veins from the umbilical cord.
Parts-per-million cube of relative abundance by mass of elements in an average adult human body down to 1 ppm. About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium ...
The human body consists of biological systems, that consist of organs, that consist of tissues, that consist of cells and connective tissue. The history of anatomy has been characterized, over a long period of time, by a continually developing understanding of the functions of organs and structures in the body.
Parts of the adult navel include the "umbilical cord remnant" or "umbilical tip", which is the often protruding scar left by the detachment of the umbilical cord. This is located in the center of the navel, sometimes described as the belly button. Around the cord remnant is the "umbilical collar", formed by the dense fibrous umbilical ring ...
[1] [10] [14] [15] The secretory organs include the subcommissural organ (SCO), the pituitary gland, the median eminence, and the pineal gland. [7] [11] These organs are responsible for secreting hormones and glycoproteins into the peripheral blood using feedback from both the brain environment and external stimuli. [7]