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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Why is scaffolding necessary in organ printing?
Most organ printing techniques seem to use a structural element for newly created cells to anchor themselves to, be it a biocompatible plastic or some natural material. Naively, I would assume that ...
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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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Transplant rejection through direct allogenic antigen detection: where do the T cells come from?
I just read a chapter in Janeway's Immunology on T cell development and thought about transplant rejection. But I couldn't figure out how the t cells develop which lead to the rejection.
So in direct ...
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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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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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Name/term for mechanisms by wich the relative size/number of cells of some tissue/organ are preserved
The cells of some organ or tissue are dividing and also dies (apoptosis). But this happens in somehow controlled manner so that the total size of the organ is approximately preserved or the total ...
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Can 1.5 gigabytes encoded in the human genome really account for the complexity of a human being?
I read the human genome is 1.5 gigabytes in size. Thats actually not a lot; Photoshop probably takes more space. Mac OS takes 10+ gigabytes of space. Also, the genome is 1.5 gigabytes when counting ...
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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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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 ...
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A theoretical ethical dilemma [closed]
For all those who keep in touch with advancements in field of biology iPSCs ought not to be a foreign term. iPSCs are now being used to make organ models to be able to study diseases and how drugs ...
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Why is xylem a tissue and not an organ?
My textbook "CGP AS-Level Biology Exam Board: Edexcel Complete Revision & Practice" says xylem is a tissue.
Then I read from this website that "[Xylem's] major components include xylem parenchyma,...
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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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Organ and Bone Marrow Transplantation?
In organ transplantation the transplant is rejected by the body's immune system , but is it possible if along with organ transplant if bone marrow transplantation is carried out from the same donor , ...
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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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Could one hear without his ear?
Might be a stupid question, but I'm quite curious about finding out ^^
If someone looses his ear, or for example cuts it of, just as Van Gogh did. Would he still be able to hear, since the actual ...
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Self Grown Organs
Could a viable organ be partially grown in a test tube then be hooked up to the host in some way until it is large enough to swap it with the bad organ?
For example: Could a smaller replacement heart ...
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Animals as organ donors and organ's life expectancy
Recent attempts to find reliable organ donors was using genetically-engineered (GE) pigs as heart donors.
The pig's DNA is altered so that its tissues will appear identical to the patient's tissue and ...
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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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Why do eyes change colour after death?
Why exactly do eyes turn black when we die? (Or even change colour at all).
The source of inspiration to this question is due to this video https://www.youtube.com/watch?v=6mNs_TcUyHc&t=627s (it's ...
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Why can't humans use dietary citric or acetic acid as a primary source of energy?
As the Krebs cycle is involved with the conversion of food in to citric acid, why can't eating citric acid be used as a temporary primary source of energy - in place of fat/carbohydrate/protein?? It ...
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Why do we need to close eyes to sleep?
Out of all our sensory organs, we need to stop taking signals explicitly only from eyes in order to sleep. Even interestingly, those who are not able to receive signals from eyes (i.e., the visually ...
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All somatic cells contain the same genome, then how does it knows that it should develop into a specific organ?
All somatic cells contain the same genome, then how it knows that it should develop into a specific organ. In https://www.youtube.com/watch?v=aeAL6xThfL8, Joe Hanson says that each cell has the same ...
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Can a hemorrhage occur after death?
Can a hemorrhage occur after death?
Specifically lung hemorrhages. Can an organ hemorrhage after death and, if so, how long for?
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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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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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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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Medical term for "holding urine for a long time"
Sometimes I get/feel pain in my stomach because of holding urine for long time. Is there any medical terminology describing: "holding urine for a long time", or pain associated with this activity?
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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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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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How does the bladder transition from releasing urine at night to being able to hold urine at night?
I wonder about this. What's the biology of the transition from wetting the bed at night to holding urine at night? Is there a chemical change with how the bladder muscles contract?
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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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Stem cell and organ growing genitals [closed]
I've been reading a lot about stem cell research and the work on growing artificial organs.
I assume, with sufficient advance in the technology, there is no theoretical reason it would not be ...
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What technique biologists use in order to determine the function of organs? [closed]
How the biologists were able to determine the functions of body organs? Using a specific example organ for an answer would be ideal.
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Normal cell diffusion in normal organism?
We know, that cancer cell can travel across an organism.
Is this ABSOLUTELY impossible for NORMAL cells?
For example, is it EXACTLY ZERO probability to find some bone cells inside liver or some skin ...
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Is DNA replaced after organ donation?
If an organ from person A is transplanted to a new human body B, is it possible that we can detect A's DNA in B?
How long until the organ's DNA is replaced by B's DNA so that we are no longer able to ...
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Lysosome function [closed]
Does any cell have lysosomes in it? Or maybe there are other organelles that do the same function. I read about it a lot and I can't find a good answer.
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Which organs need to have fluid compartments in order to develop properly?
I am a student, slightly struggling with the new concept of fluid compartments. I know that there are two main types of fluid compartment, extra and intracellular fluid. I also read that most organs ...
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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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Please identify organ
This is the gut area of an Eastern Grey Kangaroo taken of a property in the Southern Highlands of NSW, Australia. The top red organ appears to be the spleen but what is the elongated tubular organ ...
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Is there a blood panel lab test that measures all the hormone-producing glands?
I understand that there are gland-specific hormone tests, such as:
Secretin: for the pancreas; and
Prolactin/ACTH: for the pituitary; and
PTH: for the payathyroid, etc.
However, are there any "...
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Organ donation compatibility based on DNA
As far as I know, multiple tests are made before organ transplant to determine matching. Would it be possible to do the matching based on the DNA of the patients, rather than the actual serum antigen/...
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What causes tissues manifest the various forms that they do? [closed]
A heart (or any other organ) is comprised of a group of cells. To the best of my knowledge, the growth of a heart depends on cell division. However, cell division by itself doesn't seem to explain why ...
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Why does organ transplant work although it seems organ's motor neuron isn't connected to recipient's CNS
Although it seems impossible with current technology to connect organ's capillaries to the recipient's capillaries and its motor neuron to the CNS, transplanted organ works for years. But why?
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Is MHC1 knockout sufficient to prevent transplant rejection?
A few days ago I read about MHC1 knockout pigs for organ transplantation research.
I was just wondering, is it enough to knock out MHC1 in the donor (lets say from same species, pig to pig) for ...
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Does the palate truly house the sense of taste?
Source: Your “palate” is the roof of your mouth, and by extension, your sense of taste.
I was reading Etymonline's entry for palatable {adj.}, which cites and derives from palate {noun}:
... ...
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Is blood regarded as an organ?
It consist approximately 7 percent of body weight.
By definition organ is composed of multiple tissues. Blood is a fluid, a circulating tissue.
Therefore can we call this fluid system a liquid organ?...
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Why do we have to exhale (or inhale) in order to speak?
Every time we speak, sing, or make any other kind of advanced noise with our throats, we exhale, or to put it that way, blow air through our throats. Why is this required? After all, speakers do not ...
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allogeneic organ transplant and the immune response
What happens when an allogeneic organ transplant is performed on an immunocompetent recipient vs. when it is performed on an immunosuppresed recipient using a donated organ with immunocompetent cells?
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Can human organs be transplanted indefinitely?
I watched this movie, where they rented hearts to people for a year. I wonder if it is possible to transplant a heart indefinitely from person to person, or does the heart have a lifetime? So, do ...
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Identifying internal structure of dissected prawn
Note: Some of the images might be disturbing.
I have dissected prawn for the first time. Would like your help in identifying some structures
.
This is the dissection of the posterior part of the ...
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