Questions tagged [organs]
A collection of tissues which work together to accomplish a function. The organisational unit above tissues and below systems.
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What structures (i.e. organs) are suspended by tensile forces?
In several areas of biomechanical literature I have read, the concept of "tensegrity" has arisen. Definitions are as follows:
“The integrity of a stable structure balanced by continuous structural
...
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Changes in spongy urethra during tumescence
How does the columnar cells of spongy urethra expand during tumescence(erection of penis)?
If we assume that the urethra has the length, long enough to sustain tumescence without expansion of cells, ...
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Why are kidney discard rates so high?
A recent report from UNOS states:
The kidney discard rate has returned to pre-KAS levels, dropping from 20.2 percent in the first six months to 18.4 percent in months 7-10.
To me, this seems quite ...
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Can muscles remake pyruvate from lactic acid, or does it have to go to the liver in the Cori cycle?
When the muscle is exercising, and only anaerobic respiration is done, pyruvate -> lactate to regenerate NAD+. Lactate is then transported out of the muscle and into the liver, to regenerate glucose, ...
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Why is erythropoietin produced in the kidney?
Erythropoietin is a hormone produced in the kidney to stimulate the generation of more red blood cell. It is triggered by low oxygen via HIF transcription factors. Makes sense. Oops, oxygen is low, ...
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Which organs can be donated after clinical death?
The information I found about organ donation does not address clinical death. For example:
The process of donation takes place only after physicians declare a
person brain dead [...] cessation of ...
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How to tell if something is an organ or apparatus?
An apparatus is defined as
Physiology. a group of structurally different organs working together in the performance of a particular function.
An organ is defined as:
Biology. a grouping of ...
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Is there a organ or type of cell that makes Nagalase?
Schindler disease / Kanzaki disease is being described as alpha-N-acetylgalactosaminidase deficiency. So then, which organ or cell(s) produce this alpha-N-acetylgalactosaminidase (Nagalase) ?
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In Vitro Meat Initial Production
I've gotten interested in the science behind in vitro meat, and I was wondering what would be necessary to create it. Would you initially need a primary culture, or an immortalized cell line? And how ...
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Lungs permeability
My question is:
$O_2$ and $CO_2$ pass to (in & out) the bloodstream due to difference in partial pressure and its permeability to those gases (I suppose that's why no $N_2$ passes). So, to what ...
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Why heart is on the left side?
I am not a biologist
but I wonder if there is any benefit for the human to have hearts on the left side?
do animals have their hearts on the left too? or on the right?
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Is there a glossary about which infrared (IR) colors which body parts reflect?
I am doing medical research and I'm trying to find parts of the body that look about the same to the human eye, but reflect different "colors" in IR, so that using a light source and a camera of that ...
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Do all body organs grow in proportion during the period of physical development?
It is obvious that during childhood and puberty, the human body grows uniformly or proportionally so that a child's arm length, for example, is shorter than an adult's arm length but is proportional ...
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Human Fat Adipose Tissue: Maximum Energy Transferred out per Day?
The article "A limit on the energy transfer rate from the human fat store in hypophagia" states that subjects with moderate activity levels are found to have a limit on maximum energy ...
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What's the evolutionary purpose of having hearts?
According to this
New understanding of heart evolution
Humans, like other warm-blooded animals, expend a lot of energy and need a lot of oxygen. Our four-chambered hearts make this possible. It ...