050 Regulating Stroke Volume, Skeletal Muscle Pump and Frank-Starling Mechanism

[MrSsd1990]

All of your videos are amazing! Very clear explanations.

[madej1858]

 systolic is the contraction of the heart and diastolic is the relaxation of the heart, but im confused EDV-ESV. I thought esv was first because systolic is contracting and edv is relaxation. Im a little confuse in this part can you please explain? Thanks

[InteractiveBiology]

@madej1858 All questions are answered in the Interactive Biology community forums from now on. Go to the website in the description and then visit the community. This is to make it as efficient as possible as we have multiple people over there to help answer questions.

All the best

[leandermol]

@madej1858 I don't know if somebody answered this or not, but as the heart contracts always, you can look at it as a cycle. So it doesn't really matter wether you take EDV of ESV first. We take EDV first (diastolic actually being contraction of the atria), because, as we are watching the volume of the ventricle, that is the highest number. So when we do the math, we have a positive number. ESV-EDV would give a negative number, and it wouldn't be logical.

Hope you understand!

[Datsyuk0409]

@madej1858 EDV simply means the volume at the end of ventricle filling, whereas EDS means volume at the end of systole (contraction) - so the blood remaining in the ventricle after contraction

[paddii21]

thanks for explaining frank starling im about to give a talk on it

[InteractiveBiology]

@paddii21 Awesome. All the best on your talk!

[pampeliska6]

great video !! I finally understand what the frank- starling mechanism is about ! :)

[InteractiveBiology]

@pampeliska6 That's awesome :)

[TimmysMummy]

nice. Thanks.

[InteractiveBiology]

@TimmysMummy You're very much welcome!

[thatguythatownz]

hey Lesie what do you use to draw like that?

[thatguythatownz]

@thatguythatownz Leslie* sorry :P

[InteractiveBiology]

@thatguythatownz I use the Bamboo Pen & Touch. Do a google search and you'll find it. It allows me to control the pointer. Then, since I'm on a mac, I had to download a program called omnidazzle to give me the ability to "write on my screen". It's actually pretty straightforward. If you are on a PC, I think the tablet comes with a program to do it.