Blood Definition and 334 Threads

Homework Statement What is the pressure difference required to make blood flow through an artery of inner radius 2.0 mm and length 0.18 m at a speed of 5.6 cm/s?Homework Equations P1-P2 = Q8nL/pi*r fourth or P1-P2 = velocity*8*viscosity of blood*L/rsquared viscosity of blood = 4 x 10e-3 r = 2.0...

Homework Statement Blood flowing thru aorta (radius 1.2 cm) enters aneurysym of radius 3.1 cm. How much on average is blood pressure higher inside the aneursym than the pressure in the unenlarged part of aorta? Average flow rate of blood thru aorta is 110 cm cubed/secHomework Equations Q =...

Homework Statement What is the blook pressure difference required to make blood flow thru a capillary of radius 3.0 um and length 1.1 mm at a rate of 0.56 mm/s? Homework Equations P1 - P2 = ave speed (8nL) /r squared The Attempt at a Solution n of blood = 4 x 10 e-3 m/s ave...

Hello everyone, Ok generally what do they mean when they say vasodilation in periphery lead to reduction in blood pressure? Do I have to think of this as expanding the size of a fluid filled container so less fluid splashes againts the walls reducing pressure. Or do I have to think of this...

Homework Statement A sample of arterial blood was found to contain 2.6 X 10-2 mol/L dissolved CO2. The pH of the sample was 7.43. If it is assumed that in solution the CO2 forms H2CO3, what is the HCO3- concentration in this blood sample? (pKa for H2CO3 is 6.1) Homework Equations...

Homework Statement From Tipler's Physics for Scientists and Engineers(the latest edition) 71.Human blood contains plasma, platelets, and blood cells. To separate the plasma from other components, centrifugation is used. Effective centrifugation requires subjecting blood to an acceleration...

A new drug was tested on a group of 200 patients with high blood pressure. By the end of the trial period, 90 patients showed improvement from the drug, 35 patients developed side effects, and 95 patients showed no improvement and had no side effects. How many patients showed improvement and had...

I think its time we seriously educated people about food. Its now been proven again and again that natural fats and carbohydrates are not the problem with obesity and weight issues. It is the consumption of man made versions of these products. Just by cutting out foods that contain processed...

1. Homework Statement A colorblind man with blood type AB marries a woman with normal vision and blood type A who is heterozygous for both traits. What are the odds of having a daughter that is colorblind and has blood type A? 2. Homework Equations Xc Y IA IB x XC Xc IA i 3...

Hello everyone, If blood is taken to a tube it clots after a while. If the tube is glass, since it is a wettable surface the process is hastened, but my question is normally in the body when blood is flowing, anticoagulents are dominant over coagulents. Now if the blood is moving slow inside...

Friday morning I was sitting at my desk when I felt this burning sensation in my left hand. Suddenly the middle joint of my index finger started swelling up and it was very painful. Then the middle joint turned purple and looked like it had been hit with a hammer. It's been two days now and...

Hello everyone, I like to know why nerves get a blood supply. Is it because they need ATP to open protein channel to carry out action potential, or is the extra cellular matrix of a neuron determined by the blood supply. If a neuron can not carry out cellular respiration, why would it cause...

It is said that all humankind is at most six social relationships removed from each other. How many blood relationships at most currently remove every human from each other?

I try to give blood a few times every year. What's been bothering me is the feeling of weakness/dizziness/nausea right after the donation. Drinking lots of fluids afterwards (water, fruit juice, sports drinks) helped, but I continued to feel weak and tired throughout the day. Today I've...

The normal atmospheric pressure is 760 mm of Hg. But the normal human blood pressure is around 120/80 mm only. In that case how equilibrium of our body is achieved? For any vessel to retain its original shape its inside pressure and outside pressure should remain equal. If the outside pressure...

Hello guys, A capillary is made up of a single layer of endothelial cells right. So when blood cells pass through it, do the endothelial cells take blood cells up by endocytosis and then release it to other side. How do capillaries take up nutrients, do the endothelial cells take it up...

Homework Statement A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein. The inside diameter of the 4.07 cm long needle is 0.388 mm and the required flow rate is 3.90 cm3 of blood per minute. How high should the...

Homework Statement Blood can carry excess energy from the interior to the surface of the body, where the energy is dispersed in a number of ways. While a person is exercising, 0.8 kg of blood flows to the surface of the body and releases 1300 J of energy. The blood arriving at the surface...

Hello guys, I checked coagulation but I can't find the explanation of how blood (serum) suddenly turn into solid? How does this occur? Thank you! :smile:

Need some help regarding fluid flow and pressure detection:To detect blood pressure in a mouse, we usually insert a small pipe with a refined tip into the artery that is connected to a blood pressure detector. However, the problem we have been getting is that the detected blood pressure is lower...

If the blood pressure jumps from a long term pre-hypertension stage (140/90) to 175/110 for ten hours, and then calms down to pre-hypertension stage again, are there any long term effects on the body for sustaining such high blood pressure? From what I've been able to find out, high blood...

If a person loses enough blood to become moderately anemic, how long does it take for the red blood cell count to return to normal? I mean roughly...would it be on the order of days, weeks, or...? Is daily iron intake a typical limiting factor in this process?

I believe many of us have seen this in CSI, or Dexter or some other TV show or something. Some guy spraying somekind of liquid onto a surface and pointing some UV light on it. The bloodspatter shows up, even though you could not see it without this method. So my question would be what's the...

My brother is under the misconception that blood is blue. I'm not that good with explaining things, but so far I have convinced my dad that blood is red. My brother just does not believe that blood is red and not blue. What are some facts to disprove the misconception that blood is blue...

Hello! Ive been trying to understand mechanisms of blood pressure and so far the more I read the more confusing it gets. What I really don't understand is this - why does the pressure drop is largest in arterioles? The physiology book I use says that they constitute a high resistance and as...

How does elastic recoil of arteries stop blood pressure going to zero and artey collapsing? Thanks :smile:

Question given. Predict how the average life span of a nerve cell located in the brain differs from the average life span of a red blood cell. Provide a basis based on cellular features. I know that the average life span of a nerve cell is the life span of the organism which it lives in. The...

I know there is venous pooling due to gravity but how does this exactly affect pressure exerted on the walls of blood vessels. Does systolic or diastolic blood pressure decrease? Thanks!

A typical red blood cell subtends an angle of only 1.90E-5 rad when viewed at a person's near-point distance of 25.0 cm. Suppose a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance of 12.5 cm. Given that the focal length of the...

For this problem, I tried using the equation: ac=V2/r and put in 2000= ((2*pi*r)/(1/58))2*r What is the distance of a sample of blood from the rotation axis of a centrifuge rotating at a frequency f = 3480 rpm, if it has an acceleration of 2000g?

Hello everyone, How do valves in the body basically work. I can understand how blood flowing on either direction can close or open valves depending on the type of valve. But someone told me it is the elastic recoil of the veins that closes the valve. I thought it would blood that was going...

Hey . i have a question about Probabilit. it's pretty easy but very time consuming, and so am pretty sure their must be anther way to do it. so if someone know anther way to do this question please go ahead and point it to me . 3. One particular high school encourages student to donate...

Okay so I just got my new geiger counter from ebay and was taking apart an old smoke alarm to get the americium out to test it with. I was cutting away the metal housing when all of a sudden their was a snap, the cutters had bent the metal around and it had cut me. I am very scared now that the...

First of all I have to say I have really confused myself on this one by overthinking and I'll ask my questions step by step. Any help would be greatly appreciated. General rule is when blood vessels constrict blood pressure increases. 1. Ok there is a container and gas molecules in it. If I...

Homework Statement A patient is to be given a blood transfusion. If the inside diameter of the 4.0 cm long needle is 0.40 mm, the blood pressure in the arm is 2400 Pa, and the required flow is 4.0 cm³/min, how high h should the bottle be placed? (ρ = 1050 kg/m³, η =0.0040 Pa·s)...

Does anyone know or know where I could find the average mass of a single lymphocyte? Specifically, a T-cell?

Homework Statement a person is 1.8 m tall, standing upright. His heart is 1.4m above his feet. He is doing a head stand. Calculate the hydrostatic blood pressure in (a) his feet and (b) his head. Homework Equations P-Po= density x g x d The Attempt at a Solution When...

Last topic I made was misunderstood and locked so basically what I want to know is the mechanism behind numbness in legs. I don't have a numbness problem or seeking medical advice. If veins have reduced blood flow how does this create numbness. The nerves are still supplied by the arteries...

Althought I understand that a rhesus A+ can donate blood to a rhesus A+, I don't really understand why a woman can donate blood to a man despite the compatibility of the blood group. As far as I know there are a lot of differences between women and men's blood. For example hormones, the...

Homework Statement I am trying to work out what I believe to be a fairly simple 'odds ratio' problem using Bayesian probability for my physics class. Here is the statement of the problem: "Two criminals have left traces of their own blood at the scene of a crime. A suspect, Oliver, is tested...

Homework Statement I don't know why everybody ignore my urgent questions. I do not know what to do seriously. What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.60-m-tall person standing vertically? I know △p = pgh but in this...

hi i was trying to prepare for a project based on passive sensing of sound waves By using natural sound created naturally by blood flow may be turbulence flow of blood in blood vessels So i want to know how to calculate the frequency ranges which can be generated in the human body

Homework Statement The blood transports substances required by the body and the waste products of metabolism. The blood contains many different constituents including red blood cells, white blood cells, platelets and protein. However, for calculation purposes, it is sufficient to treat blood...

My wife is due by the end of August, and we plan to collect the cord blood. I was wondering what happens to our cord blood, if the cord blood bank goes bankrupt in the future?

Hello everyone, I just started biology and I have lots of clarifications If red blood cells are created in the bone marrow how do they enter the circulatory system. Do they permeate through the blood vessels?

Dear all, I am trying to find a mathematical explanation for why a blood vessel's lumen, especially an artery's, expands when the heart forces blood through the vessel upon contraction of the myocardium. This expansion is clearly evident when taking a person's pulse. I have some ideas but...

I know that blood transfusions are limited amongst blood types because of anti-gen anti-body reactions. What I don't understand is how the donor's anti-body does not react with the recipient's RBCs. For example: If a man with AB blood type received blood from an O type woman, why doesn't the...

Bad news for those of us who like the free biscuits and the little badges but potentially good news for anyone needing a transfusion. http://www.livescience.com/health/090323-embryo-blood.html

How to measure the amount of mercury in the blood of people who have filled their teeth?I mean how to make a sample of their blood which would allow us to determine the radioactivity and dose of the mercury!Has such a thing been done?

I would assume that blood, within us, is only good for so long but, I could be wrong. Also, if it does become "bad", where does it go? How do we get rid of "garbage blood"?