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Questions tagged [blood-circulation]

Tag for questions regarding the circulation of blood through out the organism and issues that may arise from dysfunction of systemic circulation.

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Why are veins not blocked by plaques?

In my textbook, it is written that atheromatous plaques block the artery. This leads to heart attack and and heart failure. But my question is why do the plaques only block arteries and not the veins? ...
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Do fat people have more chances of developing nitrogen bends?

I was reading some text on deep sea physiology. I got to know that solubility of nitrogen in fat is five times that in water. The exact text from the book animal physiology adaptation and environment ...
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What are the effects of oxygen toxicity in human blood?

I was reading some text on deep sea Physiology, and for to know that diving to do could cause oxygen toxicity in the blood. This was the exact text from the book Textbook of Medical Physiology by ...
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Why are higher doses of atropine required to produce central effects?

Reason given in my book is restricted entry into the brain..is it something to do with the chemisty?
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How does extravasation of blood into surrounding tissues decrease blood loss?

Isn't that by itself, blood loss? (This is given as the 2nd step following vascular injury) ..or is there a way this blood is taken up or something?
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In adverse effects of Heparin, why is bleeding from deeper organs more common?

The reason given in my book is that it i because it interferes with the secondary hemostasis..but i did not understand how that implies that bleeding from deeper organs is more common..
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Does blood carry metallic nanoparticles?

I find this particular chart about constituents of blood very informative and interesting. Looking through the different components, I see metals such as copper, zinc, etc. Are these only carried as ...
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47 views

How does vasodilation slow blood flow?

During inflammation, cytokines and histamine cause vasodilation to increase blood flow to the inflamed area. However, it is also said that vasodilation slows blood flow which facilitates the adhesion ...
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24 views

Blood pressure in the blood vessels

Why do the capillaries have a lower blood pressure than the arteries even though the capillaries lumen is much narrower. Wouldn't the narrowness of the blood vessel increase the pressure? Also the ...
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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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36 views

Blood Vessels (Artery Vs Arterioles)

I just have a quick question regarding what my textbook says. I have tried searching online but I have failed to find an answer. Basically, my textbook states that arterioles are smaller in diameter ...
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77 views

Cutting off circulation [closed]

How much force is required to cut off the blood circulation of, lets say the average human arm? I'm asking because i'm bored and want to try it on myself. I know that in just a couple of seconds with ...
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why is erythrocyte sedimentation rate higher in females?

erythocyte sedimentation rate should be independent of the sex. what is the reason behind this sex bias and why does it increase during pregnancy and how does age influence it.
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Flow diversion for cerebral aneurysms or stabilizing the hemodynamics?

I'm doing research of flow diverter for cerebral aneurysms applications and I'm wondering the reason behind stent placement underneath of cerebral aneurysms is to divert the flow or stabilize the ...
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49 views

How does vasoconstriction retain heat?

I am reading on vasoconstriction on wikipedia. The article states that: When blood vessels constrict, the flow of blood is restricted or decreased, thus retaining body heat or increasing vascular ...
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60 views

Is a large tumor is more likely to develop hypoxic regions?

It is known that cancerous tumors in humans can develop hypoxic regions where no blood nor oxygen arrive to some volume of its cells, creating a dead lump inside or around the tumor. See Wikipedia - ...
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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 ...
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“Blood circulation”. Why blood bleeds in atmosphere ?

If our body's blood pressure is 120 mm-Hg then why blood goes out of our body in 760 mm -Hg pressure if we have cuts?
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Turbulence in blood

Turbulence in blood flow is known to indicate diseased or obstructed arteries. Techniques to measure turbulence in blood flow are mostly based on turbulence kinetic energy measurments using MRI [e.g., ...
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Where does the human brain drain to?

When a brain has a aneurysm and the patient survives untreated then where does that blood drain to or how is it absorbed? How is the pain perceived?
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How does blood react to heat when inside the body

I was wondering: What are the possible dangers of being burned on the surface of the skin. Does it congeal (that's what my intuition tells me)? At which temperature would that happen? How heat-...
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How much blood flows to female breasts?

How much of the entire blood in the body blood flows to the breast (while resting). If you know the percentage or absolute values , as well as the total cardiac output, I would appreciate it answers ...
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862 views

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 do we feel numbness and an electric sensation in our legs after standing for too long?

We have all felt that numbness while standing immobile for a while.It gets difficult to walk.It can also happen if we are just putting some pressure on our legs Why does this happen? I'd like to ...
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28 views

Using formulas to explain why contraction of blood vessels leads to increased blood pressure

I know, I know this is probably a question too simple to be asked on a forum like biology stack exchange. Problem is, I looked many places and can't seem to find a more mathematical approach to ...
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How much arteries expand during systole?

Arteries expand during systole. By what percentage, on an average, does the arteries' diameter change during systole with respect to diastole? Answer may depend upon type of artery i.e. elastic ...
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125 views

Hydrostatic Pressure at the Venous End of Capillaries

Why is hydrostatic pressure much lower at the venous end? I have read that it is due to the fact that fluid has left the capillary, but I have also read that at a point in the capillary (around mid-...
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How powerful are dietary vasolators compared to alcohol?

Ethanol (alcohol) has a direct, noticeable and significant effects on vascular dilation. Certain dietary substances such as niacin and vitamin C are reputed to cause vasodilation. How does such ...
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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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Are new blood vessels able to deliver oxygen to hypoxic tissue before the establishment of blood circulation?

Sprouting angiogenesis - the growth of new blood vessels from a preexisting vasculature - can be triggered by cells in hypoxia in order to re-stablish the oxygen and nutrients supply to the tissue. ...
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Does donating blood lower testosterone levels? [closed]

I'm a guy and I decided to donate blood because of persuasion. My testicles feel weak afterwards specifically. I mean they feel like they're compensating -- assuming that makes sense. Is this because ...
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Does the right ventricle affect blood pressure in pulmonary veins?

Now, I know there are multiple things that push the blood through the entire pulmonary circulation like the contraction of arterial muscular walls... But what I want to know is whether the right ...
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219 views

How long can one go with necrosis?

In general, when a limb dies, how long does it take before it falls off? Can you go years with a black and useless limb, or does it just.. fall off right away?
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Is a one ventricle heart feasible?

So this is derived from a lesson at Khan Academy. The mind activity assumes that the one ventricle heart pumps blood to the lungs for oxygenation then rest of the body. However, the problem is that ...
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How urination prior to blood test may give error?

Source: Textbook of Practical Physiology, 4th Edition according to it urination within 30 minutes is a precollection factor that may alter the results of blood test. I am unable to comprehend how ...
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Why are bruises not lethal?

Given the following: bruises are caused by minor trauma which breaks blood vessels beneath the skin, causing bleeding the mechanism by which bleeding stops is clotting blood clots inside the body ...
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Why doesn't nitrogen diffuse into blood?

In school, I have learnt that the deoxygenated blood brought in to the Alveoli by Pulmonary Arteries contains Carbon Dioxide. And that Carbon Dioxide present in the blood diffuses into the Alveoli and ...
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Deionized water - can it be beneficial for metabolic acidosis?

I ran into an interesting question today that examined the science around alkaline water and its advertised 'generalized health benefits' assumed to be (but incorrectly) stemming from a rise in blood ...
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Elastic arteries and muscular arteries supplying to upper body [closed]

What are the elastic arteries and muscular arteries supplying blood to upper body (above heart) in humans?
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How does alum help in blood coagulation?

I recently came across a test in my chemistry book which says that potash alum, $\ce{K_2SO_4.Al_2(SO_4)_3.24H_2O}$ is used on cuts and bruises, because it coagulates the blood quickly. The explanation ...
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Why does our face get red during anger?

My attempt: This site says that it is due to flight or fight mechanism, which results in more amount of blood being passed to face causing red face. But isn't it wasteful for our body to send more ...
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Isolating the vasculature of an organ?

Is there a chemical or process that would dissolve or remove all other tissues in an organ and leave all the vasculature intact? I am planning to make a shelf display of the blood vessels in the heart ...
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How superficial an artery has to be for pulse to be measured manually? [closed]

Why arteries pulse? How superficial an artery has to be for pulse to be measured manually?
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105 views

What is the difference between ferritin and hemoglobin?

I have been reading that ferritin is the store of iron but hemoglobin is actually the amount of this in blood. Does hemoglobin get sourced from ferritin? Is it possible for a person to be low on ...
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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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A hypothetical emergency situation

This question was posed to me by my Biology teacher: Consider a hypothetical emergency situation of a person shot by a bullet in the heart. The bullet goes into the body and comes out from it, ...
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393 views

What is the speed of blood in when flows through the fingertip?

What is the average speed of blood as it flows through the index finger on the right hand?
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Exsanguination Time from Damage to Major Arteries

For a game project, I need to study how much blood loss is suffered when the major arteries of the human body are severed. I believe there are medical textbooks that have collected data on blood ...
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661 views

Are tergo-sternal muscles of cockroach involved in blood circulation?

Tergosternal muscles help in the blood circulation in a cockroach as well as in movement of the wings for flying. I came across a question that claims that these muscles are used in blood circulation ...
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Common site for atherosclerosis

My book( textbook of anatomy abdomen and lower limb 2nd edition - by vishram Singh pg.no:286) says: Acute arterial occlusion: It is mostly caused by embolism or thrombosis. It usually occurs in the ...