4.4 Cardiovascular: Resistance of the Arterioles

[@texastexas4541]

Very well done. Most professors don't explain this way to us.

[@saraihernandez7460]

Studying for USMLE step 1, thank you so mucho for this video!!!

[@BananaBeecher]

Actually a legendary resource - extremely useful. Thanks so much.

[@MikeB-sp6gp]

Thank you! I've just spent the past 90 minutes trying to understand Poiseuille's Equation, from Internet sources that are generally excellent (probably the case here- I just wasn't "getting it" for some reason). But, the truth is, I didn't need to understand the equation. I just needed to understand the concepts you present here. What a relief! And, BTW, I'm probably not your usual audience. I'm a 60 year old RN-- so you don't have to be a student to learn from you. Please keep the videos coming.

[@Hippomedics]

You're very welcome! So glad we were able to help.

[@_immaculata]

This was exceedingly helpful. Thanks a lot. 💛

[@jungandrea6060]

This is just amazing ❤️thank you so much💓💓💓

[@bobboo2733]

concise and to the point. May God All Mighty bless you.

[@abby6713]

clear and concise video. THANK YOU

[@ronnynoneofyourbusinessgoo7892]

This is really good. Thanks!!

[@milicao28]

Very helpful, thank you so much!

[@honeysri9448]

Tq man may god bless you

[@marwansaid2796]

That is iconic!

[@1vinurame]

Hi I have a quick question: We know that the blood pressure drop is highest across the arteriole s, and so delta P should be higher in the arteries. Is it fair to say that, since arterioles are in parallel, collectively they have a lower resistance than the arterial resistance? That would support pressure being less in the arterioles wouldn’t it? Individually, the resistances can certainly be higher in the arterioles supporting the point that they have the highest overall resistance.

[@oal5899]

Doesnt resistance increase the pressure and lower the flow? How come the pressure then drops in arterioles?

[@notadoc9697]

That's what I'm not getting. If ΔP = Q x R, then this means ΔP is directly proportional to R, so a higher R would translate into a higher ΔP.

[@THETBONE]

@@notadoc9697 delta or ∆ Pressure means change in pressure. so before the arteriole, lets say the arteries, we have a high pressure and after the arteriole we have a very low pressure ( because of the large pressure drop in the arteriole) then we actually have a high change in pressure ( high ∆ pressure, high change in pressure) Example: if we say pressure was 80 in the arteries and then dropped to 10 in the capillaries (due to high resistance in arterioles), then ∆p = 70. however if the arterioles had a low resistance then pressure drop would be lower from 80 in artery to 50 in capillaries which would equal a ∆p = 30. So ∆P = R x Q still applies, the higher the resistance the higher the pressure drop between 2 points the higher the ∆P between those 2 points.

[@ronnynoneofyourbusinessgoo7892]

Fantastic actually. You can't use Ohm's straightforwardly to figure this out, can you?

[@aggelosdidachos3073]

I am slightly confused with the last diagram. "In the arterial system, as resistance increases, blood pressure increases and flow decreases." based on another source. Which one is true then ? Pressure drops or increases when resistance increases?

[@Hippomedics]

Which part of the graph is confusing you? Arteries or arterioles?

[@halvardskeiewiencke5341]

@hippomedics I think it’s a little unclear why the high resistance in arterioles reduce blood pressure when ex. vasoconstriction (increased resistance) will increase blood pressure. Same with ex. stenosis will create increase resistance and therefore increased blood pressure, so why would the increased resistance in arterioles decrease blood pressure?

[@jarinetanda-jt1yi]

Ah, I hope this questions is already answered, I'm also confused : €

[@umefarwa4662]

@@halvardskeiewiencke5341has this question been answered yet. I’m currently struggling to understand this concept too. Please do share if you have gotten a reasonable explanation.

[@suzana00]

2022/11/21

[@nigarishkhan8907]

👌👌