How Do Kidneys Maintain & Regulate Blood Pressure In Human Body? | BYJU'S Now We Know

In this week’s video for ‘Now We Know’, we will discuss blood pressure, the role of the heart in this process, and how kidneys are involved in regulating it.
Whenever we talk about blood pressure, we always talk about the heart. But there is an extremely important organ that we always tend to miss… the kidneys! But what is blood pressure? The heart pumps blood that goes through the entire body via blood vessels. It contracts and relaxes to do so. While the blood flows through these vessels, it exerts some pressure on the walls of the vessels. The measurement of this pressure is called Blood Pressure. When the heart contracts to pump blood to other body parts, the blood pressure is at its maximum measurement. This is called systolic blood pressure. In between two contractions, there is a small gap when the heart relaxes where the blood pressure is at a minimum measurement. This is diastolic blood pressure. The blood pressure measurement we saw earlier can change depending on how much blood flows through the vessels. This is called blood volume. Since 50% of blood is water, blood volume is determined by the amount of water in the blood. And the water balance in the body is maintained by the kidneys! The blood reaches the kidneys through a blood vessel called the renal artery. Renal artery branches into smaller vessels called afferent arterioles which feed blood to the functional units of the kidneys, the nephrons. The nephrons, with the help of afferent arterioles sense any change in blood volume. If the nephrons sense that the blood volume is low, it sends less water into the urine and vice versa. The rest is reabsorbed into the blood. This happens because the kidneys release a hormone called Renin directly into the blood. And once Renin starts doing its magic, two more hormones called Angiotensin II and Aldosterone are activated in the body. These hormones signal the kidney to send water and sodium back into the blood in case of low blood pressure. In case of high blood pressure, they signal the kidney to simply excrete more out via urine. And as we know, water affects blood volume which affects blood pressure. But why sodium? Well, it’s said that water follows sodium. So, sodium moves water into the blood too with its presence. Boom! Your blood pressure is now back to normal. This way sodium balance and the water balance by the kidneys maintain the blood pressure.
Stay until the end of the video so you do not miss out on all this interesting information.

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[dtejasmathewsajesh]

thank you so much Byjus for making the videos in a way that we feel very interested and we tend to forget the fact that it is part of our syllabus

[Exclusivelyananya]

Animation helps me to observe better, Thank you so much Byju's, And congratulations for hitting 2 million subs on youtube. ✨✨🎉🎉🎉🎉

[alokendramandal]

Each day kidney around 200 litres of blood.

Each time by making such unique and interactive videos Byju's proves why it is the Best!!!
💜💜💜
#ProudBYJUite

[yakshamgoel]

The kidney filters 170 litres of blood per day. 120 ml/m is filtered. So 7 litres of blood per hour and that's how around 170 litres of blood per day.

[tonypesofficial]

2:49 the action of ma'am made me watch that part 4-5 times. Amazing. BTW very informative and new many things about BP and Kidney

[moviesisland]

I'm 23 year old but I love the way buyjus explains thinks simply .good work .keep do more videos .

[devanshthakur]

Wow Mam!!.. You taught Us So Easily.. I Understand this Very Well... You are My Favourite Mam.. ☺️ Byju Leaning App is Really Great!!.. I have Completed My 12th with Byju and Get Great Marks And Percentage in Class... And Now I am in Medical Collage.. Kidneys Filters 200Litres of Blood in A Day..

[yashaswinigarje]

Loved the way the kidneys pamper the blood drop in the end ❤😊

[Whon]

In a single day, a kidneys filter about 140 liter of blood.

[Ssyylll]

Thanks for this nice video 🥰 happy kidneys day and answer is 200l per day👍👍

[worldofart]

you should have been our biology teacher ❤️❤️❤️

[kayeshafatima]

200 liters blood is filtered by two kidneys together every 24 hours . thank for such an amazing fun fact videos💕💕 . we always learn something new from each of your videos 😇😇. and please keep uploading it

[Atharv-itbf]

Thank you mam and byjus team for this wonderful explanation with animations. 😄🤗

[ddivyakumari]

Really helpful and interesting video.
And more importantly with my favourite teacher, Tarana mam.
Thankyou so much bYJU'S ☺☺😍😍🥰🥰😍😍

[mubarizbananalemon]

I like your videos and I am in class 4 you are my best teacher love from Pakistan🇵🇰❤️

[self.d.journey]

Very nice health information, , Thanks ✍️🙏

[rakeshrah]

Great knowledge about kidney and blood pressure .😇😃👍

[videodiaries]

The number of times we go to washroom also how much water we drank affects it

[vaidyanathannathan]

Normally, in a healthy adult, the initial filtrate in the kidney's is about 180 L daily. However, the volume actually excreted is only a litre or two a day, because the remaining filtrate is reabsorbed in the kidney tubules.

[athiqsyed]

Very nice video. Social Ma'am exactly looks like doctor