Questions tagged [red-blood-cell]

Questions pertaining to red blood cells, or erythrocytes, the most common type of blood cell that is responsible for delivering oxygen throughout the body.

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What is the average rate of red blood cell production in humans?

I was doing my biology research of the day and I came across the following question: How fast are red blood cells produced and, how do I calculate this? I am currently using the following: ...
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2 answers
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How many cells does a single blood cell generally visit in its lifespan?

Taking the point of view of a single RBC travelling through blood vessels, approximately how many cells will it affect throughout its lifetime? As blood tends to provide O2 as a whole, I am taking &...
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Could the EDTA coating of tubes kill blood fed mosquitoes?

Problem is as follows: culex pipiens fed with freeze-thawed cattle blood sampled in 9ml EDTA tubes enjoy their meal and thrive. Same population fed with freeze-thawed human blood sampled in 4 ml EDTA ...
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How does the blood flow in the glomerulus when everything except plasma is drained out?

So I learned that in the glomerulus, everything smaller than the RBCs is filtered out, but I had learned previously that - Blood needs plasma, water medium to flow. So if its drained out into the ...
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How do red blood cells "identify" which cells need oxygen and nutrients?

The job of red blood cells is to deliver nutrients and oxygen to cells throughout the body, but how exactly does this work, exactly? Do cells have some kind of way to signal that they are "...
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How much oxygen is released by Hemoglobin per 100ml blood

Question Red blood cells carry oxygen from lungs to the whole body. The percent saturation of hemoglobin with oxygen depends on the partial pressure of oxygen. Higher partial pressure of oxygen means ...
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What is the time frame for coagulation of blood cells & the resulting separation of the cells and platelets from the plasma in a dead body?

I have had this subject come up repeatedly in the context of a discussion about death and how it affects the body. I found this statement, which is typical of the common understanding among non-...
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Why are cells in blood smears undetectable after absorbing moisture?

I'm a student learning how to prepare blood films and today I was curious about something, so I performed an experiment. After preparing a thin blood smear and drying it (no staining), I took a look ...
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Blood serum transfusions - could vaccines against the anti-A/anti-B etc. antibodies be derived, at least in theory?

People with the AB-positive blood type have all three of the A, B and RhD antigens present on their red blood cells, and no antibodies to these in their blood serum (aka blood plasma.) This means that ...
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1 answer
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Do sieve tube cells have any extrachromosomal circular DNA at maturity?

In order to generate a tube system of low resistance, sieve elements lose most of their cellular components such as the nucleus, cytoskeleton, ribosomes, tonoplast etc. Mature sieve elements contain ...
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How much oxygen does a brain consume?

I am not a biologist - my background is in quantitative sciences, and I am trying to answer a rather quantitative question: How much oxygen does a brain consume? This however raises many sub-questions ...
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What is the mass of a single erythrocyte?

I really have been searching through internet on different languages, but can’t find any article that answers on the question what is the single erythrocyte mass. I don’t know, I think it’s pretty ...
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What is blood pH for different animals?

So we all know that humans average blood pH is 7.4. But is it the same for the animals? I need examples of animals with the same blood pH as humans and the ones with different blood pH. I guess dogs ...
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Does there exist a reagent that can only be precipitated by Haemoglobin and nothing else?

I recently read Sherlock Holmes and in the book A Study In Scarlet, Holmes says to Watson that he has discovered a reagent that can only be precipitated by Haemoglobin and nothing else. I know about ...
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Why is arterial pO2 normal in carbon monoxide poisoning?

Arterial blood gas measurements often show that pO2 is 'normal' even though haemoglobin is bound to carbon monoxide with high affinity. Is this because there is still oxygen bound to some subunits of ...
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Why is sickle cell trait expressed in half of all cells rather than all cells containing half-sickled haemoglobin

If sickle cell trait is due to be heterozygous with respect to a single gene mutation on the haemoglobin β-globin chain, why is it the case that ~50% of RBCs are sickled rather than half of the ...
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Why haven't humans been able to make blood producing vats?

There are people in hospitals in life threatening circumstances that need blood packages, and they fully depend on blood donors' blood. With our current technology, we have been able to "persuade" ...
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Non-nucleated cell-like population with RNA

We're working on invertebrate hemolymph (blood) and we have found with flow cytometry (staining with DRAQ5) a cell-like population without nucleus but it has RNA production. Does anyone any ...
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Why are red blood cells not attacked by NK cells?

All cells containing a nucleus present MHC-I, while some specialized cells present MHC-II in addition to that. Since erythrocytes lack any MHC why do natural killer cells not attack them? It is my ...
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How do veins's valve pocket sinus tend to become hypoxic?

For context, this question relates to the formation of deep vein thrombosis as I read that hypoxemia in vein can trigger coagulation cascade and cause a thrombus to form in vein. I read that vein's ...
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Question on compatibility of blood groups [duplicate]

How come a person with blood group O can donate to a person with blood group AB? Since there are A and B antibodies in the O blood group blood surely this would cause agglutination in the blood of the ...
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Why does B12 deficiency enlarge red blood cells?

I'd like to know why B12 deficiency enlarge red blood cells
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Where do Red Blood Cells use energy?

I know that RBCs use glycolysis of glucose to lactate to produce most of their energy, but, if they are just carrier cells, where do they use the energy?
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Why can humans tolerate eating onions but other mammals like dogs and cats cannot?

Onions are one of the many foods we shouldn't feed our pets. Looking it up, I learned that onions cause hemolytic anemia in MANY species: cattle, sheep, horses, dogs, cats, and even some primates. If ...
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1 answer
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Why is there a layer of moist lining the inner walls of alveoli?

I'm taught that the walls of the alveoli are moist, so gaseous oxygen molecules can dissolve into this water. This then allows the dissolved oxygen (liquid state) to diffuse faster from the alveoli ...
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Do blood cells immediately die after leaving the body?

I am wondering, do blood cells die right after they leave the body?
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Why do musk deer have the smallest red blood cells and amphibians have the largest?

What is the reason that musk deer have the smallest red blood cells and amphibians have the largest? Should they not be proportionate to the size of the organism?
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2 votes
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Why is erythropoietin produced in the kidney?

Erythropoietin is a hormone produced in the kidney to stimulate the generation of more red blood cell. It is triggered by low oxygen via HIF transcription factors. Makes sense. Oops, oxygen is low, ...
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Red Blood Cell Size Vs White Blood Cell Size

I have just found out that white blood cells are larger than red blood cells and now I'm confused due to something I learnt in class. Basically, I was taught that there were spaces between the ...
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Is too much CO2 in the air toxic?

I know that if there is too much CO2 in the air we will have too much greenhouse effect. I would like to know if there is too much CO2 in the room, something like 3% while there is also more that ...
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19 votes
4 answers
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Are red blood cells prokaryotic?

After searching "do antibiotics impact the immune system" I found out that antibiotics target prokaryotic cells. It all made a lot of sense thinking about all those yogurt recommendations you get ...
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3 votes
1 answer
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What would the RBCs of someone heterozygous for sickle cell anemia look like?

Would half of the RBCs look normal, and the other half sickled? Or would all of the RBCs have slight deformation/sickling? Thanks!
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Why there are no RBCs in lymphatic vessels?

I know the following. Leukocytes (white blood cells) are made in the bone marrow, and naive leukocytes go to the blood vessels. So, leukocytes mainly exist in blood vessels. Endothelial cells ...
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Osmosis in red blood cells and bacteria

This is a question from an exam in my biology course. Bacterial cells and human red blood cells were inserted into one solution. Upon testing one hour later the blood cells exploded, while the ...
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12 votes
2 answers
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Why isn’t Haemoglobin a plasma protein, rather than being encompassed by the erythrocyte?

Erythrocytes (red blood cells) are a common feature of almost all vertebrates. What evolutionary advantage do they provide in containing haemoglobin, rather than it being just a plasma protein? In ...
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Why does Anti-A antibodies make type-A blood type clump?

A-type blood has B-antibodies; it also clumps anti-A antibodies are inserted. Why is that? The blood has no antibodies against the A-antibodies to make clump in this way.
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Is carbon dioxide dissolved in plasma same as carbonic acid?

Carbon dioxide is transported through blood via 3 methods : 1. Dissolved in plasma 2. As bicarbonate ion 3.through RBCs. The carbondioxide when transported as bicarbonate ion i.e HCO3- and H+. What ...
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Sickle cell life span

How long do sickle red blood cells "live" before being broken down in phagocytosis? I had trouble doing a normal search as it brings up life span of those inflicted with the disease. Also, I have ...
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Is erythropoietin released when breaking down RBCs

I came across the MCQ in my physiology book, it says: Erythropoietin..... i) may decrease the life span of RBCs. ii) is not released on breakdown of RBCs. iii) may stimulate the stem cells. iv) is ...
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Effect of hemoglobin on colloidal osmotic pressure

If Hemoglobin gets out of RBCs, my book says that colloidal osmotic pressure of plasma increases. Hence, filtration of fluid across capillaries is prevented. So the heart increases its work to be ...
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8 votes
1 answer
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Picture of a camel's red blood cells

I'm an art student in need of a little help. I'm looking for microscopic pictures of camel's red blood cells, I need their shape for an art project. The pictures I find on Google seem a little ...
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2 votes
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Why do erythrocytes have no MHC1 but platelets do?

Red blood cells do not have a considerable number of MHC1 through their membranes, and that's explained by them not having a nucleus. But why do platelets have MHC1s if they have no nucleus either? I ...
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2 votes
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Why women have high Erythrocyte sedimentation rate? [closed]

Why ESR (Erythrocyte sedimentation rate) 1. higher in women 2. increases with age 3. increases in pregnancy, infection, malignancies what I thought so far : since women are menstruating so there ...
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2 votes
1 answer
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Blood transfusion

Can we exchange the antigen present on membrane of RBC's so that it can be transfused from one person to other ? As we face problem to find required bloodgroup at the time of emergency especially O ...
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8 votes
2 answers
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Why do people with type O blood have anti-A and anti-B antibodies?

People with type O blood have anti-A and anti-B antibodies, even without receiving a transfusion. Why?
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Non-splenic pools of erythrocytes?

In splenectomized animals, where could red blood cells be released from, to explain an increased hematocrit after exercise or muscular contractions?
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Are there any exceptional cases in which a person with O negative blood group cannot donate?

Are there any exceptional cases in which a person with O negative blood group cannot donate or any case in which compatibility might not be established between O negative an any other blood group?
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Hemoglobin oxygen affinity curve

I have a general understanding of the Bohr effect, and that Hemoglobin's affinity for oxygen will shift depending on the conditions of the lungs and tissues. However, I'm struggling with the following ...
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2 answers
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Does the red blood cell in frogs undergo amitosis?

It is a notion particularly popular among Chinese high school Biology textbooks, that the red blood cells in frogs can undergo amitosis (not mitosis), a claim which I have not been able to find ...
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3 votes
1 answer
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Why are red blood cells preferred to study the structure of plasma membrane?

If we wanted to study the structure of a plasma membrane, why are red blood cells a more attractive cell type to work with than other cell types such as liver cells or kidney cells?
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