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1answer
57 views

How do cells age and die if they are dividing into new cells?

If cells in our body keep on dividing into new cells how do they ever grow old? The only cells to grow old would be defunct cells or those who won't divide into new cells like nerve cells. What am I ...
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0answers
9 views

Can the presence of Y chromosomes in tissue play a part in trigger tissue rejection in opposite sex?

Can the presence of Y chromosomes in tissue after a tissue graft or transplant from a male to a female play a part in triggering tissue rejection other than other main factors? If so, how?
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0answers
21 views

Synthetic biology: examples of cell orientation driven by genes or genetic modification

First of all, forgive for the naive question. I know that genes can drive the shape of cells, as the sickle-shaped red blood cells. On the spirit of synthetic biology or tissue engineering, does ...
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2answers
979 views

Why are skin moles (pigmented spots) circular in shape?

I have never seen a rectangular or triangular shaped mole. Is there any reason for why moles are roughly circular in shape?
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0answers
25 views

How quickly does plant cells regenerate? [closed]

This is a question from my Biology class homework? I've looked online, but I can't find the answer.
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0answers
25 views

Diffusion coefficients of glucose in mammal tissues?

Where can I find estimates/experimental measurements of the diffusion coefficient of glucose in mammal tissues? Specefically I mean the inter-cellular space. I'm not looking for a specific tissue, so ...
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1answer
43 views

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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2answers
200 views

Density of cells in human tissues?

Where can I find values, or estimates, of the density of cells in human tissues? Maybe an overall estimate, or distinct values for distinct tissues? Or maybe not human, but mammal tissues (which ...
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0answers
56 views

Do “scars” in humans replace all the skin layers or only some layers?

When someone has a cut or surgical incision that results in a "scar", is the scar tissue replacing all 3 layers of the skin (epidermis, dermis, hypodermis)? Or only the first one or two of them?
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1answer
66 views

Is there any possible way to take a DNA test without using blood in humans?

Is there any possible way to take a DNA test without the need to draw blood in humans? Any information will be useful for me.
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0answers
94 views

Diffuse DAPI staining after time in tissue

My student is using ProLong Gold with DAPI (premixed) on sheep uterine tissue. We have used this reagent for some time with great results. Now, when she finishes her immunofluorescence protocol, ...
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1answer
242 views

Why do some people burn and others tan?

Connected to What is happening when we get a tan? - Why do some people burn while other people tan? Very pale people tend to just burn while other people tan very nicely, what causes this difference? ...
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3answers
3k views

What is happening when we get a tan?

Almost everyone nowadays wants that nice summer tan, but what exactly is going on beneath the skin? I've heard a few different theories about tanning - such as a tan is nothing but the pigmentation in ...
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0answers
33 views

Regarding cryonics, why can't you freeze a living body and then thaw it later, fully functional?

Cryonics is very popular in science fiction today, as a method of preserving animals, including humans, for long time storage and thawing the tissue later in the future. What is the difficulties with ...
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3answers
105 views

Can a portion of human skin cells be modified in some way to generate light? [closed]

I have come across some species of living organisms who are able to emit light at whim. Can that ability be incorporated into a portion of human skin (a specialized tissue)?
4
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1answer
275 views

Trying to differentiate between the three muscle tissues with small pictures

For an assignment I have to differentiate the three types of muscle tissues in these three pictures . I'm having difficulty seeing the striations and branches etc. because the pictures are so small. ...
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0answers
182 views

How does air-liquid interface (ALI) culture work?

For studying diseases, such as chronic obstructive pulmonary disease (COPD), cells are often grown in air liquid interface. I understand that the common way of establishing this these days is to grow ...
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1answer
1k views

What is the difference between the basal membrane and the basal lamina?

I'm researching about the basal lamina in lung tissue and I'm not sure if the basal membrane is the same. What is the difference between them?
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1answer
88 views

Is there any evidence that soft tissue can be preserved for 65m+ years and if not what hypotheses exist to explain it?

I read an article on howstuffworks.com and they mentioned how we have found soft tissue in dinosaurs. According to the article even Mummies and Mammoths have no soft tissue left. Is there any evidence ...
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1answer
285 views

What are the main differences between lab-grown tissues and natural tissues from living animals?

What are the main differences between lab-grown tissues and natural tissues from living animals? Using a biologist's classic "structure (anatomy) and function (physiology)" idea, I thought about the ...
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2answers
4k views

Is epimysium same as fascia?

I have read that epimysium is dense regular connective tissue made covering the a muscle like bicep brachi. at the same time we have fascia that is made of dense regular tissue and covers muscles. so ...
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1answer
169 views

Why is brown fat brown?

I read in Tortora and Derrickson Anatomy and Physiology that : Another type, called brown adipose tissue obtains its darker color from a very rich blood supply , along with numerous pigmented ...
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2answers
81 views

Why will tissue from identical twin be rejected in some cases?

From Medline Plus : Also, transplants from one identical twin to another are almost never rejected. My question : Why can a tissue from an identical twin be rejected ?
2
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1answer
109 views

Plant tissue culture [closed]

Tissue culture means that cells are propagated and multiplied under controlled conditions. Suppose the following situations: a) A seed being is embedded in an Agar medium and germinated under ...
0
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1answer
1k views

Which surfaces contain no epithelial tissues and which epithelial tissues are vascular?

Epithelial tissues are found on all the surfaces of the body; including external surfaces and surfaces of organs etc. Are there any surfaces which do not have epithelial? I have read in my book that ...
3
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1answer
28 views

External tissues, connected to the body?

Some cancer tumors suppress themselves from spreading. When such tumors are removed by surgery, the metastasis process is accelerated. Isn't it possible to put such tumors into external device like ...
3
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1answer
193 views

How do muscle relaxants work?

Do they act directly on the muscle and actually relax muscle tissue and ease spasms, or do they just prevent your brain from receiving signals that inform you of tight muscles? In the latter case, ...
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1answer
79 views

How different are tissue-specific fibroblasts from each other?

I am planning to utilize a new system in our lab, in which I will co-culture cancer cells from different tissues with fibroblasts. I have the option to receive skin-derived primary fibroblasts. I ...
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2answers
175 views

Blood circulation and blood pressure in different tissues [closed]

The volume of blood coursing the blood circulation is approximately five litres. A typical vein will stretch about eight times as much as corresponding artery. Because veins have high capacitance, ...