How blood pressure works Wilfred Manzano
If you lined up all the blood vessels in your body, they’d be 95,000 kilometers long and everyday, they carry the equivalent of over 7,500 liters of blood, though that’s actually the same four or five liters recycled over and over, delivering oxygen, and precious nutrients like glucose and amino acids to the body’s tissues. All that blood exerts a force on the muscular walls of the blood vessels. That force is called blood pressure,.
And it rises and falls with the phases of the heartbeat. It’s highest during systole, when the heart contracts to force blood through the arteries. This is your systolic blood pressure. When the heart is at rest between beats, blood pressure falls to its lowest value, the diastolic pressure. A typical healthy individual produces a systolic pressure between 90 and 120 millimeters of mercury,.
And diastolic pressure between 60 and 80. Taken together, a normal reading is a bit less than 120 over 80. The blood traverses the landscape of the body through the pipes of the circulatory system. In any plumbing system, several things can increase the force on the walls of the pipes: the properties of the fluid, extra fluid,.
Or narrower pipes. So if the blood thickens, a higher pressure is needed to push it, so the heart will pump harder. A highsalt diet will lead to a similar result. The salt promotes water retention, and the extra fluid increases the blood volume and blood pressure, and stress, like the fight or flight response, releases hormones, like epinephrine and norepinephrine.
That constrict key vessels, increasing the resistance to flow and raising the pressure upstream. Blood vessels can usually handle these fluctuations easily. Elastic fibers embedded in their walls make them resilient, but if your blood pressure regularly rises above about 140 over 90, what we call hypertension, and stays there, it can cause serious problems. That’s because the extra strain on the arterial wall.
Can produce small tears. When the injured tissue swells up, substances that respond to the inflammation, like white blood cells, collect around the tears. Fat and cholesterol floating in the blood latch on, too, eventually building up to form a plaque that stiffens and thickens the inner arterial wall. This condition is called atherosclerosis,.
And it can have dangerous consequences. If the plaque ruptures, a blood clot forms on top of the tear, clogging the already narrowed pipe. If the clot is big enough, it can completely block the flow of oxygen and nutrients to cells downstream. In vessels that feed the heart, that will cause a heart attack, when oxygendeprived cardiac muscle cells start to die.
High Blood Pressure 140
(upbeat music) 140, just another number, right? Think again. It could mean all sorts of bad things. Swimming is great, but swimming with 140 sharks is a bad idea. Ever tried to write more than 140 characters in a tweet? Good luck with that.
Drinking 140 proof alcohol might harm your health. It’s also flammable at room temperature. Ever been on a bus with 140 school children? You could be scarred for life. Gain 140 pounds and get ready for serious health problems, and you might need a new scale. 140 is too much of a lot of things,.
And it’s too high for blood pressure. A blood pressure reading of 140 over 90 or higher means you’re more likely to have a stroke or a heart attack. Visig heart HBP to find out more about controlling your blood pressure.