Questions tagged [tissue]

An organization of cells sharing functional similarities.

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24 views

who knows what is this picture? [closed]

Can anyone try to help me identify this picture? Thanks!
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20 views

EM field in living organisms and tissue resonance frequency

I have two questions which I can't find enough information about, and I would be very grateful if someone could give me a lid to the answer: As far as I know, if we accelerate charged particle it ...
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22 views

fibrous skeleton of the heart

is it true to say that "fibrous skeleton is between all of the myocardium and most of the cardiac muscle attach to that"? cause I can't get this that how can it be between all the muscles.
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1answer
51 views

Why do viruses cause different symptoms?

If the sole purpose of a virus is to hijack the nucleus of a cell to replicate, why do we have different symptoms for different viruses? I can think of the following comming into play: immune ...
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1answer
64 views

Why do meristematic cells have prominent nuclei and dense cytoplasm?

I've been reading about meristematic cells having prominent nuclei and dense cytoplasm. However, I could not understand why it is that way. Could somebody please explain?
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Parietal and Visceral epithelia

If you google visceral and parietal you get: The parietal layers of the membranes line the walls of the body cavity (pariet- refers to a cavity wall). The visceral layer of the membrane covers the ...
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Type VII collagen binds type IV collagen?

What are the functions of type VII collagen ? My book says it 'binds type IV collagen', does that just mean it binds type IV collagens together to form a sheet or a network of type IV collagen for ...
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1answer
196 views

What does lymph actually look like?

I have scoured Google and a number of my anatomy textbooks for a picture of lymph. However, I cannot find any such photo (or video) showing its actual appearance. Can someone provide a reputable ...
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13 views

Where can I get frozen spinal cord from mouse?

Is there a company that sells frozen spinal cord (not sections) from mice? Not for use in academia. Thanks.
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2answers
56 views

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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2answers
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Could bacteria and phages be found in tissues?

in the literature, there are several studies of the gut virome and microbiome, for instance Reyes et al. on Nature (https://www.nature.com/articles/nature09199?error=cookies_not_supported&code=...
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1answer
1k views

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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131 views

Why is cartilage replaced by bones in a vertebrate adult?

Why is cartilage present in a vertebrate embryo replaced by bones in an vertebrate adult even though cartilage can also provide me the structural framework like as in Chondrichthyes and they seem to ...
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1answer
33 views

White blood cells after dealing with an infection

I just have a quick question. If there was an infection of a tissue within the body, white blood cells would leave the capillaries around the tissue and enter the tissues to help cure the infection. ...
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1answer
902 views

Is pith a ground tissue with no specialized function?

Here is a question from the book My Max Score SAT Biology E/M Subject Test (where the SAT is the exam taken by American high school students): Ground tissue with no specialized function A. Xylem ...
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60 views

Can Anyone Identify this Tissue?

I am hoping someone can identify the image below My wife felt a bug bite her and found this in her hair now she's worried that it was a tick. the photo is at 40X under microscope. I'm guessing it's ...
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140 views

Do all Fungi have similar cells?

I know that most fungi are not differentiated into tissues. And tissues are groups of specialised cells aiming to perform a collective function. Does it, then, follow that most fungi do not have ...
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212 views

due to hypersecretion of growth hormone why only terminal growth takes place?

why only terminal growth takes place in acromegaly and gagiantism, due hypersecretion of GH?
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1answer
67 views

What are the roundish objects in this sketch of a tracheid?

I got this picture from the Wikipedia entry for Tracheid. What are the roundish objects in the sketch? Also are tracheids sclerenchyma cells?
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1answer
201 views

Might new bones evolve from soft tissue? [closed]

I wonder how bones evolve where there are none. (This is the question, read the sub-questions as examples :) ) Lets take an elephant as an example. If it was adaptive for the elephant, could bones ...
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seafood muscles - how do they work?

Today, first time in my life I ate seafood. It was a squid and a calamar. Note that I am biology layman, so please be merciful :( While dissecting my food I noticed that the tissues of those ...
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1answer
37 views

Is it possible to extract tissue-culture material from a seed?

Here is the problem: Tissue culture is cloning, and all plants from the same mother plant are identical. On the other hand, plants grown from seed are all different. If parent plants are genetically ...
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1answer
571 views

What do you mean by non cellular matrix [closed]

What do you mean by the non cellular matrix in which connective tissues are embedded?
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1answer
2k views

What are pit fields?

I found this statement from my biology text book, "The sieve tube elements and the companion cells are connected by pit fields present between the common longitudinal walls". Is the pit field same ...
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Recession of skin tan

In early October I was on a holiday near the equator and got tanned. Now, roughly 3 months later, the tan on my face and arms has gone almost entirely where my belly, chest and legs are still ...
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1answer
760 views

How do trees grow?

A nail is inserted into a tree's trunk at a young stage of its development. At which height will we find the nail after some years? Will it be found higher or at the same height(What extent of ...
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240 views

Does the Histogen Theory apply to plant roots as well as stems?

My school textbook briefly mentions a certain "Histogen Theory" (von Hanstein) of plant growth/development. However, I can't find any authoritative source on this matter online. According to my book, ...
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3answers
80 views

Is it possible to determine what tissue a DNA sample came from based solely on its sequence?

All cells have the same genome and differ only by the expression pattern. Is it possible to determine the tissue origin of a cell based on its DNA sequence using short tandem repeat (STR) analysis or ...
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1answer
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Is there a surface or body cavity that does not have epithelium?

Is there any surface in the (human) body that is not covered with epithelium?
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1answer
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most different human tissues with respect to gene expression profiling

Is there a PCA showing the relative distance in terms of gene expression / functional genomics among the different human tissue types? So far I have found: (1) A paper based on gene expression with ...
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Can anyone expolain this? Cell culture vials have strange hair-like condensation patterns

What is the hair-like polymer that condenses on the caps of the plastic cell vial? Inside vial are cells in a mixture of FBS and DMSO. The vials were frozen slowly in a special isopropanol-filled ...
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How are negligibly senescent animals dealing with senescent cell buildup?

Well known animals like the rougheye rockfish, which can be bought from the fish market, appear to be negligily senecent. Senecent cell buildup appears to play a key role in senecence, in mice at ...
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1answer
162 views

How is yellow elastic cartilage a true cartilage?

My book has only mentioned the fact but no reason is given so I would like to know the reason for it. I would like to know what more to add in the body but the question just doesn't get posted.
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How long can you store tissue on 4°C before B-cell extraction and culture?

We receive tissue regularly and extract B-cells for culturing, studying differentiation and survival with diffenet stimulation conditions. However, often the tissue arrives late afternoon and might be ...
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1answer
1k views

If cells regularly renew, why do we have scars?

Question may sound bit poetic but I have a pretty basic question here: Often we get a minor wound and cells renew and quickly "cover" it. But when we have deeper wounds, often they leave behind scars. ...
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102 views

Histology tissue

Can anybody tell me from where is this tissue taken and in with techique is it colored please ?
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1answer
18k views

What is the cell matrix?

What is the matrix in the cell, and how does it connect cells together? I read about this in my textbook. I know that a matrix is the material (or tissue) that connects other cells together. My ...
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1answer
286 views

How can soft tissue exist in dinosaur fossils?

In this article the author explains that they found soft tissues inside of 68-million-year-old dinosaur fossils. How can that be possible? It was believed that soft tissues cannot last more than a ...
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1answer
712 views

Tissues in plants and animals

What is the equivalent connective tissue in plants? Connective tissue in animals are mostly made up of collagen. What about in plants?
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2answers
18k views

Which organs/tissues are defined as “peripheral organs/tissues”

In the following paper [1], I encountered one term "peripheral organs". Literally, based on my understanding, it should be related to the organs/tissues, such as skin, hair and ear in the human, and ...
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Are the human placenta chorionic villi and villous tree the synonyms?

Are the human placental chorionic villi and the villous tree the synonyms? Or, if not, can I say that these tissues would have practically the same gene expression profile in an RNA microarray ...
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1answer
738 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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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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102 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
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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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3answers
4k 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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1answer
317 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
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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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1answer
1k 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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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 ...