@letty3434 With regular exercise, one of the things that happens is that the heart gets more efficient at pumping blood. In other words, our Cardiac output increases. One of the ways of doing that is by decreasing End Systolic Volume. I talk about that in episode 50. Check it out and it should help you understand it.
You have just made a new fan in Puerto Rico. I found this video so helpful and clear to understand (that's the best part)! I never quite understood how stroke volume was calculated, and thanks to you now I do!
How do you find the end diastolic volume and the end systolic volumes? I understand how to use those values to find the SV, but not how to find those values in the first place
So just to make things clear, if EDV = 120mL and ESV = 50ml the stroke volume is 70mL. so 70mL of blood is pumped to the body when the ventricle (mainly referring to LV) contracts?
@letty3434 You should check out the video I uploaded today - Episode 53. That will help. The main idea is that with regular exercise, the heart gets better at ejecting blood from the heart. Everytime it beats, it send out MORE blood than in an untrained person. In other words, there will be LESS blood in the heart after it contracts. That is the End Systolic Volume and it is decreased. Once again, check out Episode 53.
@letty3434 This is another one for Episode 53. Cardiac output stays the same. That's because stroke volume increases and heart rate decreases. CO = SV * HR. They balance each other out. Check episode 53 for a more detailed explanation.
@LINLAN22 Glad to know this video helped and you're finding them fun to watch. We have more at the site that you might find helpful... STay tuned, we have more Biology videos coming soon!
I just want to thank you so much for your fun and awesome videos. I just found your channel, and it is really helping me learn and retain the information. I feel very confident about my next exam! THANK YOU & GOD BESS! :)
OMGGGGGGGGGG thank you so much!!! I was realllyy looking for an example to help me understand this better and how to copy it and you illustrated it with perfection!! Thank you!!
Mr. Samuels!!!! Small world!!! I googled this topic and chose the first video that came up! I am an AU Alumni (class of 2013) , now I am in medical and really appreciate the help you are sharing in these videos!
omg your such a blessing thank you soooooo much for these videos you do not know how much you've helped me with class. Will you be posting any videos on blood
Awsome video quick question im currently a emt and im tryin to understand perfusion better. In my text books it says perfusion depends on cardiac output and that cardiac output is determined by multipling stroke volume by heart rate all of this I understand. However im wondering what is used to measure stroke volume is there a machine that does this or can it be determined by vitals or a ekg. I guess what im asking is can SV be determined in the feild or does it require a hospital setting thanks
My question is where do you get the number of ESV and EDV..... am I going to get if from the result of blood pressure reading?..... for example 140/ 80,.... so SV is 60?....... because you did'nt explain where we can get the numbers,.... its a graph only
hello i like all the videos because they help me to reconcile with my school notes. failed to down load the videos wolud appreciate if yu sent them to me email. thanks
question. When heart rate increases, the diastole time gets reduced more than the systole does. Does this mean that the stroke volume gets reduced but the high heart rate makes up for the loss of stroke volume and still increases cardiac output? I know CO=SV x HR. But I just dont understand how the stroke volume isnt affected by a shorter diastole
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Thanks for the video! I am a personal trainer trying to educate myself more! Thanks for the great visuals! I have a hard time just reading text books so your videos are perfect for me!
I really appreciate your work and it is being really helpful. But I'd like to point on one thing: systole and diastole are not the contraction and relaxation of the HEART as you mention. These two terms are the contraction and relaxation of the ventricles only, not the whole heart. Because of the atria remains relaxed during systole and diastole. Thank you and keep doing what you do.
physiology finals = gonna watch all your vids!! they've been so helpful! hope u never stop uploading! i appreciate all the time u put into making these vids to help students like me who doesn't understand the material right away in class! thank u again and God bless:))
Wow, I'm so glad you found it helpful, %name. I'm just trying to be helpful with these videos so I'm glad it's working 😉. Btw, if you aren't already subscribed, I highly recommend it. I have a lot more great stuff coming and if you like this, you'll like those too.
Thank you so much for your wonderful videos! I am a dental student and am watching all of your cardio videos before I get started studying for my physiology exam and it feels great to have a solid foundation on all of this challenging material. Your videos are brief but extremely informative and I really appreciate all of you hard work in putting them together. Best wishes!
That's a good question. You have to be careful to understand the difference between pressure and volume. You seem to be thinking about pressure. Systolic pressure is the highest pressure (during contraction) and diastolic pressure is the lowest pressure (relaxation). If you take the difference between those two values, you get the pulse pressure. However, in this video, I'm talking about volume, which is the amount of blood. In this case, at the end of systole (contraction), you just pushed out all of the blood. So the volume of blood in the ventricles will be the lowest amount. That's the ESV and that is the bottom number. Then when the ventricles relax, the blood is allowed to go back in. The volume will continue increase until the end of diastole. At that point (right before the ventricles contract again) you will have a full ventricle. That's at the end of diastole - the EDV. So the key point here is about the volume, which is different than when we're focusing on pressure. Makes sense?
I am an EMT-B as well. Cardiac output can't really be determined in the field. Just know that cardiac output has an influence on blood pressure. The equation for blood pressure is BP= CO x TPR. So the CO can influence the blood pressure which you get in the field. To fully understand the basics I recommend taking anatomy 1 & 2. But if your a basic, you will most likely never use this. Just know what the vitals should be, and what variations could mean.
you are a super star... your work is so clear, and well explained. Thankyou thankyou and thankyou again. I too am on my way to having watched all your videos. Making physiology fun !!! I had a look at your website too... I love it ... would def recommend it to other ppl who love your vids xxx
im sorry to say but you know i love you! i truly do because the way youve made my assignment so easier for me- not only have i used what you have said for my assignments but ive learnt so much from your videos..well done man! continue what youre doing
Thank you so much. All you video is so valuable to me cuz it helps me to understand better and you break it down easier way. I can't tell you how much u helped me through my A & P 1 and A & P 2 . thank you again.
Medial school goes way to fast for us and they teach like crazy.... so we have to resort to great videos like yours... Thanks for sharing your knowledge...
You are very much welcome @@xhuljetazina5868. Glad you got value from it. Make sure to subscribe to the channel, because I have a lot more content like this coming to help you understand how the human body works 👍🏽.
Magnesium chloride cleans blood vessels and therefore prevents and avoids stroke. Because it removes the fats from the blood vessels and impurities inside them that clog them up. It improves the varicose veins as well or makes them disappear, and lowers the pressure of those who have high blood pressure, making it lower and normalize and never getting high again. But it has to take for a while and then stop. It cannot take forever, because otherwise it may give some problem. Hope it helps everyone and hugs !
I've been watching all your cardio videos today! really enjoying your clear and understandable explanations. thank you :) also, you remind me a bit of the Science Dude from Bones! haha
I do appreciate the clarity with which you explain each topic, your voice is calm and allows students to really understand what you are explaining, UNLIKE the professor that we got at City College :(
Thank you very much, Natalie W. I appreciate the compliment. My main goal here is to be helpful. If you haven't already, make sure to subscribe to the channel because I have a lot more content like this coming to help you understand how the human body works.
I'm so glad you're loving the videosl, @saraibartholomew2680. You are welcome. If you haven't already, make sure to subscribe to the channel because I have a lot more content like this coming to help you understand how the human body works.
Interactive Biology Can you please do a topic about afterload. I really love your videos and they have been helping me with my revision. I will be so happy if this can be explained . thanks
Omg I finally understand . when my teacher tried to explain this the whole class was confused . Sometimes you just need to put things in simplified terms so students can understand without all the fancy jargin
I'm so glad you found it helpful, Alba Reyes. You are welcome. If you haven't already, make sure to subscribe to the channel because I have a lot more content like this coming to help you understand how the human body works.
