How blood pressure works – Wilfred Manzano
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How blood pressure works – Wilfred Manzano

September 1, 2019


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 high-salt 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 oxygen-deprived cardiac
muscle cells start to die. If the clot cuts off
blood flow to the brain, it causes a stroke. Dangerously clogged blood vessels
can be widened by a procedure called
an angioplasty. There, doctors thread a wire
through the vessel to the obstructed site, and then place a deflated
balloon catheter over the wire. When the balloon is inflated,
it forces the passageway open again. Sometimes a rigid tube
called a stent is placed in a vessel
to held hold it open, letting the blood flow freely to replenish the oxygen-starved
cells downstream. Staying flexible under pressure
is a tough job for arteries. The fluid they pump
is composed of substances that can get sticky and clog them, and your typical healthy heart
beats about 70 times a minute, and at least 2.5 billion times
during an average lifetime. That may sound like an insurmountable
amount of pressure, but don’t worry, your arteries
are well suited for the challenge.

Only registered users can comment.

  1. At 9 years old I had an angioplasty done. And now I have an aneurysm where they did the procedure. There are risks to benefits. The doctors have told me my aneurysm is strong. I have always suffered from high blood pressure from birth. I was born at 7 and half months. Which is why they think my aorta was narrow, but this wasn't caught until I was older.

  2. Remember when our parents told us that in order to get a good education you had to go to college? Yeah that was great.

  3. What about the hypertension caused by worring about this happening inside me? Humans- So advanced we can kill ourselves by thinking about our own health…

  4. awesome video… hope that formal education can get this way. juat realised at the middle of the vid that this is ted's property. thanks ted

  5. From what I red months ago. Salt consumption of about 11g per day is optimum. It’s not really bad to have salts right?

  6. What happens in whole universe that can happen in our galaxy what happens in our galaxy that can happen in our solar system what happens in our solar system that can happen in our earth, what happens in earth that can happen in our body. So doctor are great respect from an engineer.

  7. The salt part is kind of out of context. More salt, by itself taken acutely, will raise blood pressure. However having a diet high in salt, while also getting adequate potassium ( no one does) will not raise the blood pressure. Sodium/Potassium is a balancing act. It just so happens most people have very sodium heavy diets.
    Fun facts: Athletes will typically drink pickle-juice for the extra salt. In the military, a salt mixture is added to the potable water supply while on missions in hot climates.
    Choline Bitartrate (a cheap supplement) can drastically lower blood pressure.

  8. I feel so smart cause we're currently learning this in science, but I know as soon as we move on to another unit Imma forget it

  9. I have experienced high blood pressure & getting medicines from the time that I was Twenty six years old. Of all the so-called remedy I have personally tested out, “Nο†οvα Yuku” (Google it) is definitely the one that has shown to work with my blood pressure level. The medicinal drugs prescribed to me to have were not of used any more after having a month of dependably, ,loyally following this guide. .

  10. Its scary how im learning about blood pressure in my anatomy class and this video just cMe up in my recommended.

  11. It's scarying thinking given the amount of high blood pressure in the United States. This is probably how most people die from having a stroke. Will it be me?

  12. I really hope that ted ed could make a science and history book with these type of animation . Want it so bad 😭😭😭

  13. My blood pressure has apparently been low my whole life and I just found out because the doctor said my blood pressure is 96/60 and I’ve lived a healthy life and I’m not overweight or underweight with a normal diet

  14. wow very informative. My mom who recently collapse due to hypertension brought me here. First time happening to her but she's doing well.

  15. What about low blood pressure? It can be dangerous too! It can cause fainting and therefore head injuries 🙁

  16. 140/90 it is a TED liar, ask any Indian doctor, or a ND. No Mr Pharma and Mr Hospital must get its $$$$, sucker.

  17. My Great Grandfather was the first person in either Britain or England (can't remember which one exactly) to have an angioplasty. He was on the news, it was when it was in it's experimental stage.

  18. TED Ed- (1:41) A high salt diet will lead to a simalar result. The salt promotes water retemption. The extra fluid increases the bloods volume and pressure and stress like the fighter flight response.
    Me- Eats pretzels

  19. Not a very long time ago, in reality only just couple of days had surpassed, I tried to apply this blood pressure treatment plan “Zοtοku Weebly” (Gοοgle it) and advancement followed right away. It definitely is stabilizing!!! I have noticed significant betterment in just SOMETHING LIKE 20 days of making use of this approach. After Twenty-five days and nights my pressure is normal (for me) 120/55.. .

  20. Please do mention that a whole foods plant based diet can completely reverse heart diseases and other life threatening diseases

  21. "but don't worry, your arteries are well suited for the challenge" is amazing proof of God's creation totally beyond human expectation!

  22. Since implementing Heron methods a months ago, I just wanted to let you know that I did just one day of the 3 exercises and went from 155/95 to a reading, the very next day, of 121/82. I’m so excited, and I hope to be even lower by the end of the week. I’ve been on Amlodipine and Lisinopril for months, and haven’t been able to get it lower than 135/90. I am now sleeping much more soundly and my head is much more clear, etc. For more information about Heron method, click here : healthighway.com/6w4s

  23. I have a constant systolic pressure of 180-190 and a diastolic of 70-90. I'm 16 years old. This is stage 3 of the disease?

  24. Sugar destroys the arteries, but the cholesterol gets the blame while it is only doing it's job to heal the ruptures.

  25. {ذَٰلِكَ عَالِمُ الْغَيْبِ وَالشَّهَادَةِ الْعَزِيزُ الرَّحِيمُ (6) الَّذِي أَحْسَنَ كُلَّ شَيْءٍ خَلَقَهُ ۖ وَبَدَأَ خَلْقَ الْإِنسَانِ مِن طِينٍ (7)} [السجدة : 6-7]

    ( 6 )   That is the Knower of the unseen and the witnessed, the Exalted in Might, the Merciful,

    ( 7 )   Who perfected everything which He created and began the creation of man from clay.

    ♡🍃

  26. Yeah, our arteries are well suited to the challenge, because God made them this way, and not because of any accidental evolution.

  27. I have had hypertension & taking medicines ever since I was 26 years old. I was happy I discovered 4BloodPressureRemedy.blogspot.kr

    sooner since my blood pressure decreased to the standard level using its help. Right after pursuing the recommendation of this author, in just one month I just need to take half my medications.?

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