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Questions tagged [tissue]

An organization of cells sharing functional similarities.

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40 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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Typical concentration of oxygen for hypoxia and necrosis due to lack of nutrients

I'm a physicist and I'm interested in hypoxia due to the lack of nutrients at the center of avascular tumors. So I have a few questions about hypoxia. Below which concentration of oxygen and other ...
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1answer
28 views

Why is cartilage replaced by bones in an vertebrae 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 Chondrichythes and they seem to ...
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1answer
23 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
135 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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0answers
38 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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0answers
58 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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0answers
64 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
52 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
154 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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46 views

Considering the function, how does the bone tissue is a connective tissue?

As we considering the materials which consists of the bone tissue we can clearly see ,it is a type of connective tissue. But considering the function, its main function is building the Skeleton. ...
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0answers
12 views

Polysporin/antibioltic ointment and agar plates

Has anyone tried applying a layer of antibiotic ointment to the surface of their agar after autoclave sterilization? A friend suggested that I use an antibiotic in my agar. So it got me wondering if ...
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0answers
35 views

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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24 views

How much of a tissue is made from cells vs extracellular matrix?

How much of a tissue is made from cells vs extracellular matrix? (in any suitable unit ratios, such as volume or mass) I assume that the answer depends on the tissue - I'm interested in typical ...
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1answer
30 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
326 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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0answers
16 views

Collagen Type V

Lodish - Molecular Biology of the Cell: "Two quantitatively minor fibrillar collagens, type V and type XI, co-assemble into fibers with type I collagen, thereby regulating the structures and ...
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1answer
890 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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0answers
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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
315 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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0answers
135 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
72 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
1k views

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
89 views

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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0answers
42 views

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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0answers
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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
109 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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0answers
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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
984 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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2answers
71 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
9k 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
263 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
570 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
7k 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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0answers
35 views

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
579 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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41 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
2k 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
88 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
93 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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3answers
3k 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
175 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
81 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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1answer
989 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
7k 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
44 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
219 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)?
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1answer
911 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
1k 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
7k 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?