Questions tagged [tissue]

An organization of cells sharing functional similarities.

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Vertebrae looking bone found on beach in New Zealand

I found this bone on a beach in New Zealand. Does anybody have any idea which part of the body or which animal it’s from? (click to enlarge)
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What is the difference between cuboidal and columnar epithelium (other than their shape)?

The difference between squamous and cuboidal/columnar epithelium is clear. Squamous is used for filtration and diffusion while cuboidal/columnar is used for absorption and secretion. But if both of ...
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What is the proper anatomical name of the "band of Richer" that wraps around the quadriceps femoris?

There's this fascial band called the band of Richer that wraps around the quadriceps femoris muscle above the knee (in this illustration, look for it near the left knee). It seems to stem from the ...
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Can tissue flow apart instead of being tightly attached?

Every tissue of our human body consists on cells and cells are not like static "LEGO bricks". They are highly dynamic and can actively move around, due to myosin-actin networks inside the ...
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Why doesn’t heart have smooth muscle tissues?

Smooth muscle tissues are involuntary. And so is cardiac muscle tissue. So why doesn’t heart have smooth muscle tissues like most organs? I know that they are visually different (branched vs non-...
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Reference for standardized histology rating criteria of microscope images

I am looking for a reference to a standard protocol for assessing the visual quality and diagnostic potential of a tissue sample that has been processed and stained for viewing under light microscope. ...
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How arteries split into smaller blood vessels?

I am not sure if I am asking question that is hard to answer precisely. I just have begun learning about anatomy and physiology and have watched bunch of human dissection videos online. I feel like ...
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Why do cells in meristematic tissues lack vacuoles?

Cells located in meristematic cells in plants lack vacuoles. However, this contradicts with the fact that plant cells have large vacuoles to store water and keep the plant in an upright position. I ...
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What is tissue patterning?

This term gets thrown around sometimes in biology articles, and I have a rough idea of what it is: during embryonic development, the tissue differentiates in a certain spatial configuration. Wikipedia ...
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Most optically transparent muscle phantom?

I am trying to use Schlieren imaging techniques to visualize how a sound wave propagates through muscle tissue. In the past, when needing to experiment with muscle we would use an agar based muscle ...
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Characteristics of 'true' tissue

Why are sponges not considered to have tissue level organization? Quite a few places seem to say that sponges do not have 'true tissue' and only have specialized cells. Unlike Protozoans, the ...
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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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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 coming into play: immune response ...
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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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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 image ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Histology tissue

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