The study of blood, the blood-forming organs, along with blood diseases and their treatment.

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How can an individual have A- and B- antibodies and no A- and B-antigens? [duplicate]

Why, or how, can someone of the "O Blood group" have A- and B-antibodies without having A- and B-antigens? This doesn't make sense to me, as an antigen is required to trigger antibody production?
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2answers
50 views

Diffusion coefficient of cells in blood?

What's the diffusion coefficient of white cells in blood? Is it well defined, or are cells too large and few as to be treated as particles in this context? P.S. I have tried to look this up, but what ...
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1answer
26 views

What is the reason for 'microcytic' anaemia?

I know the causes for microcytic anaemia are Fe deficiency, prolonged inflammation, Thalessemia, Sideroblastic etc. All these logically point to a decrease in Haemoglobin synthesis - either Haeme or ...
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4answers
13k views

Why do men have a higher hematocrit (red blood cell count) than women?

The hematocrit, also known as packed cell volume (PCV) or erythrocyte volume fraction (EVF), is the volume percentage (%) of red blood cells in blood. It is normally 45% for men and 40% for women. so,...
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8 views

Can the salinity level in human blood be altered by diet?

My question is regarding is it possible to control the salinity levels in a human blood system by diet. I understand how salt works in the blood and just want to know if it can be controlled.
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Does oxyhaemoglobin is less likely to unload oxygen in the presence of 2,3BPG?

Red blood cells may contain a molecule known as 2,3-bisphophoglycerate (2,3BPG). When 2,3BPG binds to haemoglobin a higher partial pressure of oxygen is needed to bring about 50% saturation of ...
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2answers
2k views

What part of food gives the blood red color?

Roughly, what I know is, when we eat food it goes into our: Stomach > Small Intestine > Large Intestine > Rectum. So, it just moves through a digestive pipe. What I don't understand is, what part of ...
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39 views

Is it possible to transfer acquired hemophilia with breast milk?

There is a transplacental form of acquired hemophilia: http://www.jpeds.com/article/S0022-3476%2895%2970132-X/abstract This disease is caused by polyclonal immunoglobulins (IgG1 and IgG4) against the ...
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8k views

How to translate a blood type used in Eastern Europe?

What are the I-IV blood type descriptions shown below (commonly used in Eastern Europe), and how do you translate them into the ABO-system?
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100 views

Blood clumping in mosquitos

Will a mosquito die due to blood clumping if it sucks blood from two persons having different blood group? What will happen in its gut? Is there any mechanism to avoid clumping ? Or mosquitos know ...
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1answer
107 views

What Effect would Cannabinoids have on the Acute Porphyrias?

I should be clear in saying that this question is NOT intended for personal medical advice. Rather what I am looking for is journal articles and/or books that touch on this subject because I think it ...
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1answer
77 views

Why I cannot find dendritic cells in blood smear?

According to many sources including wikipedia, there are haematopoietic stem cell derived dendritic cells in the blood. figure 1 - haematopoietic cell lines - ref Despite of this, when I examine ...
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38 views

Blood antigens and immune response

In my textbook, the definition of an antigen is written as follows: Antigen: A substance that the body recognises as foreign and that can evoke an immune response The following image also confused ...
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0answers
13 views

Why isn't prothrombin time used to measure heparin treatment?

I know the identical question has been asked and answered, but I felt that the answer was not addressing the concern I have so I decided to post/re-post it as a new question. The specific concern I ...
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1answer
50 views

Would a vial of anticoagulated, warm blood attract mosquitoes?

Would mosquitoes feed on free blood as an easy source of nutrients? They home in on veins by means of infrared light (heat detection). Also, blood needs to be in liquid form. So would they feed on ...
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1k views

Does a blood transfusion cure disease?

Does transferring blood between two people also transfer all the white blood cells? Why can't AIDS victims with low t-cell count just get blood transfusions till they have more t-cells? Why can't ...
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3answers
699 views

Do other animals have different blood types?

Humans have the ABO and Rhesus blood typing systems. I have two questions about it: Why have we evolved these blood types? Do other animals have different blood types as well?
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70 views

Making a offspring with O+ blood [closed]

If offspring is O+ what blood type would parents have to have to make this possible?
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27 views

Is H antigen considered as an agglutinogen?

A and B antigens which have the potential to cause agglutination in certain cases are called agglutinogens. But, as far as I know, H antigen cannot give rise to agglutination. So can it be said that H ...
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34 views

Do other animals have similar blood types to humans? [duplicate]

I am interested to know if there are any animals having blood groups similar to human blood groups? Is it possible to transfuse blood between humans and those animals?
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45 views

PEth test blood and incidental exposure [closed]

Is PEth level 37 high from a blood test. Incidental exposure possible ?.
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0answers
101 views

Chart of blood pH across different animal species?

How does blood pH vary across species? I can't find an article or chart listing this kind of information. So far I've found bits and pieces like: Human blood pH is nominally 7.4. 7.4 seems to be a ...
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0answers
44 views

What is effect of sperm in blood?

Staphylococcus aureus, Streptococcus pyogenes, and Clostridium perfringens all produce hyaluronidase. Each of these bacteria are pathogens (use hyaluronidase as a virulence factor to destroy the ...
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35 views

Could You Boil Water from Blood? [closed]

According to Wikipedia... About 55% of blood is blood plasma, a fluid that is the blood's liquid medium, which by itself is straw-yellow in color. The blood plasma volume totals of 2.7–3.0 ...
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89 views

Identifying an Unknown Blood Type [closed]

The following case study has a student working with blood samples to identify their blood types (A, B, AB, and O). Consider the situation and answer the questions. A student is given eight ...
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1answer
67 views

What is the oxygen carrying capacity of reticulocytes?

What is the oxygen carrying capacity of immature red blood cells, or reticulocytes? Is there any difference between oxygen carrying capacity of mature and immature red blood cells?
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36 views

When there's a wound, the end result is a thrombus or thrombosis?

When there's a wound, the blood vessels are damaged. To stop the loss of blood, the clotting cascade starts off and forms a clot. This clot is a thrombus, right? Seems like perfect physiology. Where ...
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HSC Cycling Rates

I would like to know how often human hematopoietic stem cells go into cycle in the bone marrow niche (with a paper reference). I have heard they cycle 1-2 times per year but has anyone robustly ...
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1answer
96 views

Cis-AB phenotype verification

I know that my blood type is AB. I wanted to know if I am cis-AB since cis-AB seems to have a different approach in blood transfusion. Is there a lab test that can verify is a person is under cis-AB ...
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1answer
40 views

Why does ESR have to be waited for one hour?

It is said that the length of the column of clear plasma in a narrow tube left by erythrocytes which gradually sediments after one hour is the measure of ESR(erythrocyte sedimentation rate). Its ...
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1answer
5k views

Why is prothrombin time test not used for heparin

Prothrombin time test is used for the monitoring of warfarin but not heparin. Why is this used for warfarin monitoring and why is it not used for heparin monitoring?
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2answers
1k views

How does Bernoulli’s Principle apply to the cardiovascular system?

Below are graphs which illustrate the cross-sectional area, velocity, and fluid pressure through each vascular segment of the cardiovascular system. It makes sense that velocity and cross-sectional ...
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1answer
39 views

How does protein enter bloodstream?

If a hemophiliac patient injects his factor 8 through the veins directly into the bloodstream to provide the body with clotting factor... Why don't they just make the drug as a pill and have the liver ...
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1answer
358 views

What will happen if a foetus is Rh- and the mother is Rh+?

If a mother has Rh-negative blood and her foetus has Rh-positive blood it will result in rhesus incompatibility and lead to erythroblastosis fetalis. What will happen if the reverse occurs, when a ...
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5k views

Is blood an organ according to biology?

It consist approximately 7 percent of body weight. By definition organ is composed of multiple tissues. Blood is a fluid, a circulating tissue. Therefore can we call this fluid system a liquid organ?...
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Blood sampling at home

I want to collect small blood samples at regular intervals (e.g. every 8 hours or more often) over a longer period (weeks to months). To avoid having to go to a lab or doctor to have this done, I want ...
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1answer
38 views

Who and when was the first human diagnosed with hemophilia, or considered a carrier?

The earliest case I can find is Queen Victoria of England, who ruled from 1837-1901. Is this the first hemophilia case on record?
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2answers
179 views

Are erythrocytes lysed during alpha hemolysis?

Wikipedia says: When alpha hemolysis (α-hemolysis) is present, the agar under the colony is dark and greenish. Streptococcus pneumoniae and a group of oral streptococci (Streptococcus viridans or ...
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Number of LT-HSCs in mice and humans

I am looking for the number of long term hematopoietic stem cells in both humans and mice if somebody has references for these two numbers. I have very old estimates, but I would like something much ...
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1answer
48 views

How much is local blood non-Newtonian in Pathophysiology?

I am studying the Barus effect / Merrington effect / die swell / extrudate swell, which is a characteristic of non-Newtonian viscoelastic liquids (Introduction to the phenomenon in this video) i.e. ...
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23 views

Could drugs promoting angiogenesis be used as a treatment for burn victims?

From what I've learned from my textbooks and in class lecutures it seems that inducing angiogenesis for people with severe burns would be an excellent way to speed up the healing process. Is this ...
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2answers
113 views

Blood draw from the elderly or those with tiny veins

A lot of people have very small veins making it next to impossible to draw blood. Would a nitroglycerin tablet (or some other vasodilator) before drawing blood help to enlarge veins?
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1answer
3k views

Why are red blood cells considered to be cells?

Wikipedia states that a cell is the basic structural, functional and biological unit of all known living organisms. Cells are the smallest unit of life that can replicate independently. It then ...
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75 views

Proteases in the blood

I’m reading on hormones and the book talks about how peptide or amine hormones are easily broken down by proteases present in the blood plasma. This has led me to question the interactions between ...
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1answer
171 views

What is the difference between Amino acids from blood and urine?

I would like to understand the difference between different tests for Amino Acids. Any blood laboratory offers amino acids tests using 3-4 methods Blood serum Urine Random Urine 24 hour (all the ...
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1answer
158 views

What happens to blood after a person dies?

After a human dies, what happens to their blood? I know that it tends to accumulate in the lower areas of the body, whichever parts are closest to the ground, but I am wondering about coagulation. ...
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1answer
58 views

Wheatgrass in thalassaemia

In local newspapers there was a not so recent story about wheatgrass juice being "curative" in thalassaemia. Although I do not take the article at face value, it would be enlightening to know if there ...
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2answers
8k views

Possible genotypes for blood types?

If I am blood type B, what are all the possible genotypes that could be expressed by my parents? I think it might be 16 but I was reading online and saw this: Similarly, someone who is blood type ...
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2answers
15k views

Why do people have antibodies against other blood types?

The ABO blood type divides each blood type according to whether they have the "A" and "B" antigen(s) (AB has both, O has none). People also have antibodies against the antigens they don't have (AB has ...
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10k views

What is the difference between regular blood, a woman's and a virgin's menstrual blood?

There are many stories that blood contains the life-force energy and specifically menstrual (period) blood has always been a feature of many rituals and some ancient Sumerian tablets mentioned that ...