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Questions tagged [immune-system]

This tag is for general questions related directly or indirectly to the vertebrate immune system, but are not questions directly related to Immunology, the discipline of the study of the immune system.

3
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2answers
136 views

What do memory cells actually do?

So I know that memory cells "remember" the most efficient way to kill a pathogen should it show up again... but what is the mechanism by which memory cells become activated by the second contact with ...
2
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1answer
88 views

How some virus are able to reach the CNS?

I know that the lymphocytic choriomeningitis virus (LCMV) could provoke meningitis and encephalitis when this virus reaches the brain. However, there are other viruses like Varicella (VSV), ...
0
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1answer
70 views

Is a species lifespan affected by meat consumption?

I read a review-like article about the hypothesis of Caleb E. Finch in a science magazine. The article of interest engages with the idea of Finch "[arguing] that immune functions and nutrition ...
0
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1answer
63 views

Are there macrophages in the blood vessels and within the blood stream?

Monocytes are phagocytes that "evolve" or "differentiate" into macrophages. I read that there are monocytes in the blood stream and vessels and that macrophages are found mainly in other tissues and ...
4
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0answers
122 views

How much time does it take for the naive T Cell to get activated?

Suppose a naive T cell comes in contact with an APC. How much time does it take for the T Cell to get activated and within how much time does the T cell move away from the APC due to incompatibility ...
4
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0answers
292 views

Where do B cells produce antibodies?

I was recently at a Leukemia and Lymphoma Society conference where a particular oncologist lecturer claimed that all antibodies are created in the bone marrow (I won't mention his name, as he was a ...
3
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0answers
94 views

Do symptoms of common cold infections correlate with the infectious agent?

The common cold - in summary, an acute upper respiratory tract viral infection - is one of the most frequent viral infections in humans and can be caused by about 200 viral types [Eccles (2005)]. ...
2
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0answers
52 views

The difference between Mast Cells and Basophils

While reading the Wikipedia article on Mast cells, I came across something that confused me. What is the major difference between a Mast Cell and Basophil? They both seem to do the same exact ...
2
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0answers
80 views

Regarding Passive Aritficial Immunity: Why does the concentration of the foreign antibodies decrease over time?

So, like suggested in question, I am extremely confused about this one concept. That whether or not the injection of foreign antibodies ( passive artificial immunity ) triggers an immune response. ...
2
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0answers
43 views

What natural defence mechanism does the human body have against lead poisoning?

It is known that lead ion takes place of necessary ions, like calcium, in the body, but does not perform their task, hence wrecking the system. So how does the body eventually recognise this threat ...
2
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0answers
190 views

Does testosterone weaken the immune system?

I was reading this articles here that states that the higher the blood level of testosterone is, the weaker the immune system gets. I read another article about testosterone here that focuses on the ...
1
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0answers
13 views

What is the difference between cytokine and chemokine?

I often see these terms being used in inflammation, and I'd like to know, are they synonymous with each other or do they mean different things? Also could someone provide an example of each?
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0answers
20 views

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) ?
1
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0answers
163 views

What is the difference between an active and inactive T helper cell?

1- Are all inactive T helper cells "T memory cells" ? 2- Is there anything such as active T memory cells ? 3- I have noticed that there is also a third type of T helper cells but i dont know what it ...
1
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0answers
52 views

In the event of an abrasion, do mast cells cause vasodilation or vascular constriction?

Or both? I am unsure as to what mast cells will do in the event of a wound either on the epidermis or the epithelial. I know they secrete factors that mediate vascular constriction / dilation, but I ...
1
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0answers
72 views

Meaning of proliferation rate of 3 day−1

The abstract of an article in Journal of Virology contains the following line: We find that CD8+ cell proliferation begins 1 to 2 days after infection and occurs at an average rate of 3 day−1, ...
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0answers
75 views

Do allergens have structural similarities to pathogens?

The conventional popular explanation of allergies is that the immune system confuses allergens with pathogens and reacts to them as such. Is there any merit to this explanation? If so, I would ...
1
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0answers
69 views

Why does a centrocyte have a cleaved nuclei?

Why does a centrocyte have a cleaved nuclei? Is there a biological reasoning behind this phenomenon or is it the nature of the centrocytes? Does the selected centrocytes proliferate too?
1
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0answers
956 views

What is significance of opsonization?

Wikipedia says Antibody opsonization is the process by which a pathogen is marked for ingestion and eliminated by a phagocyte. Opsonization involves the binding of an opsonin, e.g., antibody, to ...
1
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0answers
34 views

Are immunosuppressors necessary after a bone marrow transplant for Bubble Boy Syndrome?

I know that under normal circumstances, immunosuppressors are needed to mitigate the host body's immune reaction to the graft. However, people suffering Bubble Boy Syndrome have pretty much no immune ...
1
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0answers
30 views

How do microbes develop resistance to anitmicrobial peptides?

I would like to better understand how bacteria use the "strategy" of alternations to lipid A and membrane proteins in order to resist antimicrobial peptides of the immune system? It is my ...
0
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0answers
12 views

Megakaryocyte Multichoice Question

A megakaryocyte: is characterised by a single, large nucleus. gives rise to trabecular bone. is a type of haematopoietic cell. is typically found in yellow bone marrow. I believe it is (1), although ...
0
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0answers
12 views

Is it possible to vaccinate an adult with whole-cell pertussis vaccine?

Some time ago a "vaccine-resistant" strain of pertussis has been discovered. As I understand, the strain lacks one of the antigens targetted by the acellular vaccines. An obvious remedy is to use ...
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0answers
32 views

Finding difference amongst system of equations for HIV

Given the following figure and the following variables and parameters, I have been able to come up with the set of differential equation below the image. My question is how does the system of ...
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0answers
34 views

Are parasites that wouldn't have infected an individual if it hadn't handicapped more likely to kill than others?

By the Immunocompetence Handicap Hypothesis (Karter & Folstad, 1992), individuals with good immunity invest in sexually selected characteristics and in doing so forego investing in immunity. The ...
0
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0answers
22 views

How do T cells deal with the obstructions in their path of migration?

When T cells move in the blood, are their any obstructions(other cells) while they migrate? If there are then how do the T cells overcome such obstructions in their path? Do they move past them or ...
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0answers
641 views

How lymphocytes in lymphatic system get oxygen?

We know that the gas-transporting protein hemoglobin is absent from the lymphatic system. So, how does gas transportation takes place in lymphatic system? Is mere diffusion from surrounding blood ...