How does blood pressure machine physically work?
483587
It is basically a u tube manometer.\n\nThe pressure of air in one side (air inside an air bag) of the u tube is measured by the excess of mercury level in the other tube.\n\nThe air bag is made to surround one’ arm and pressure of air inside the bag is increased by pumping air inside.\n\nBecause of high pressure the blood circulation below the arm stops.\n\nBy slowly releasing the pressure and noting the pressure at which circulation of blood starts is noted. This is the highest pressure and again at a lower pressure the pulse is noted this is the lowest pressure.\n\n Systole refers to the contraction of the heart and conventionally systolic arterial pressure is the highest pressure developed in arteries during the ventricular contraction of the cardiac cycle. Diastole refers to a relaxed heart muscle and diastolic pressure has conventionally meant the lowest arterial pressure during a heart cycle. The pulse pressure is related to the amount of blood being pumped per beat. It is the systolic minus the diastolic pressure.
247027
I came across the site below.  It has some good articles about defibrillators.  They have information and advice on the use of blood pressure monitors that you may find helpful.
235093
If the average is 80 beats per minute, then the heart muscles contract around 115,000 times a day. \n\nNo it does not depend on your blood pressure, it depends on your pulse.
829630
physics is present in every aspect of this universe...\nas a nurse u need to measure a lot of human activities like blood pressure,heart rate etc....these r measured with the help of different apparatus....the experiments that u perform now will give u a brief introduction of the different phenomenon that take place.\n   These experiments will further help u to understand the mesurement system n will also help u to find out correct measurements.......\n        keep enjoying the experiments...have fun... :)
1074878
In the human anatomy, we have 2 atria and 2 ventricles.  The ventricle structure works like a bladder in a water pump to create the pressure to push the blood out into the circulatory system.  After the ventricle contracts and is empty, a supply of blood is needed to refill for the next contraction.  Think of the atrium as a bucket ready to dump into the ventricle.  It allows fast refill at low pressure.
699517
Heart rate and blood pressure is controlled mainly from the cardiac center and the vasomotor center in the medulla respectively. Ventilation is controlled from centers in the medulla and pons. Both medulla and pons are part of the brain stem. In addition, there are also other peripheral baroreceptors (BP control), and chemoreceptors (ventilation rate control) involved.
951860
It's difficult to explain without diagrams.\n\nFirst you have an air supply at about 20 psi that flows through a restrictor and a small nozzle the same size as the restrictor. There is a flapper, a small piece of metal that covers the nozzle and controls the backpressure between the nozzle and the restrictor. The pressure between the restrictor and the nozzle is controlled between 20 and 100KPa (3 to 15psi) by the position of the flapper. The position of the flapper is controlled by the input current (usuall y 4 to 20mA of 1 to 5V). Thus the input signal varies the pressure out. I havent seen any links but I will look
728172
You can't determine a blood pressure by counting a pulse.  You need a blood pressure cuff.  You can approximate a blood pressure depending on where you feel the pulse.  If you feel a strong radial pulse (the pulse in the wrist) the pressure is usually at least 80 mmHg systolic or above.  If you can't feel it in the wrist but you can feel it in the groin it is usually around 70 mmHg systolic.  If you can only feel a pulse in the carotid artery (the pulse in the neck) the blood pressure is around 60 mmHg systolic.  The systolic pressure is the peak pressure in the arteries in the cardiac cycle.  This is the top number in a blood pressure.  Normal blood pressure is 120/70, however normal is usually higher or lower for most people.
8699
blood pressure, force exerted by the blood upon the walls of the arteries. The pressure in the arteries originates in the pumping action of the heart, and pressure waves can be felt at the wrist and at other points where arteries lie near the surface of the body (see pulse). Since the heart can pump blood into the large arteries more quickly than it can be absorbed and released by the tiny arterioles and capillaries, considerable inner pressure always exists in the arteries. The contraction of the heart (systole) causes the blood pressure to rise to its highest point, and relaxation of the heart (diastole) brings the pressure down to its lowest point.\nBlood pressure is strongest in the aorta, where the blood leaves the heart. It diminishes progressively in the smaller blood vessels and reaches its lowest point in the veins (see circulatory system). Blood pressure manifests itself dramatically when an artery is severed or pierced and the blood (under pressure) ejects in spurts.
248090
Some people are symptomatic with high blood pressure.  They will experience chest pain, headaches, vision changes, neurological defects (such as numbness, tingling, weakness).  If you have any of those symptoms you need to see a doctor.  You can always go to your local drug store where they have free blood pressure machines set up.  Also if you have associated risk factors you may want to get checked up.  These include diabetes, previous/current heart disease, smoking, high cholesterol, type A personality.
956248
The hydrostatic pressure is generated by the pumping force of the heart. It pushes water out of the capillaries.\n\nThe water potential is created due to the inability of large solutes to pass through the capillary walls. This buildup of solutes induces osmosis. The water passes from a high concentration (of water) to a low concentration in an attempt to reach an equilibrium. This draws water back into the vessels. Because the blood in the capillaries is constantly flowing, equilibrium is never reached.\n\nThe balance between the two forces is different at different points in the capillaries. At the arterial end of the vessel, the hydrostatic pressure is greater than the water potential, so the net movement (see net flux) favors water and other solutes being passed into the tissue fluid. At the venous end, the water potential is greater, so the net movement favours substances being passed back into the capillary. This difference is created by the direction of the flow of blood, and the imbalance in solutes created by the net movement of water favoring the tissue fluid
848153
heart rate is defined as the number of beats( systoles) the heart produces per unit of time( ussually per minute).\nBlood pressure is the pressure exert by the blood to the vessel´s walls( the arteries and the veins).
303652
All right, I'm first going to explain, briefly, the structure of the cardiovascular system, and then I'll move on to how the blood transports oxygen specifically.\n\nYour heart pumps blood from the right ventricle to your lungs, where it exchanges carbon dioxide for oxygen, and then continues to your left atria. The left atria pumps the blood to the left ventricle, which pumps blood through your arteries  to your capillaries, where the oxygen is released so that cells can use it. Carbon dioxide is picked up, and the blood continues to the veins, and back to the right atria.\n\nNow, your blood contains red blood cells, which contain two important molecules, hemoglobin and myoglobin. Both have a high affinity for oxygen, so, in your lungs, where there is a high oxygen concentration, oxygen binds to each of these two molecules (until the equilibrium point is reached). The red blood cells are pumped throughout the body. \n\nIn the body, the concentration of oxygen is lower than in the surrounding atmosphere, so the amount of hemoglobin (and myoglobin) which is binding oxygen decreases until it reaches the new equilibrium point. Active tissues use oxygen quickly, forming lots of CO2, which enters the blood, and is converted to carbonic acid by red blood cells, using the enzyme carbonic anhydrase. The change in pH lowers the affinity of hemoglobin for oxygen, so more oxygen is released from other red blood cells near working tissues. The carbonic acid is released back into the blood from red blood cells, where it dissociates into a proton (H+) and a bicarbonate ion. It travels through the blood back to the lungs, where it is converted back into CO2, and diffuses across the transport surfaces of the lungs due to the concentration gradient. Then the cycle starts over.
974511
The heart is what pumps blood throughout the body, keeping all organs functioning. Blood flows to the body through arteries and blood flows back to the heart through veins. Its all one big system - the circulatory system.
525411
the american heart association has a lot of good info.\n\nFor taking blood pressure purchase them a digital BP cuff - you just slide it on your arm and push a button - it will inflate & deflate and display the results on a screen.  Many of them will also save the results up to 10 tests.\nThey also come in large display models for older people with sight impairments also.
9374
It does not lower the blood pressure but it prvents clotting of blood inside the blood vessels (Thrombosis).
762826
Hydraulic machines work on Pascals principle.\nAccording to it the pressure exerted on a confined fluid is tranmitted equally and undiminshed in all directions.\nSo we can apply a small force on a large area and that pressure is transmitted throughout the fluid.\nThis pressure can be used to lift relatively large load(or force) by making it act on a small area of cross-section on the platform of the machine.\nPascals Principle is : P1=P2\nor\nF1/A1=F2/A2