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And one that kind of jumps to mind is carbon dioxide (CO2).
首先想到的是二氧化碳
So carbon dioxide is waste for this cell.
這個細胞代謝出二氧化碳來
So it's making some waste and for the moment let's imagine that there's no blood flow.
細胞產生廢物，假設血管中沒有血流
So, even though there's a blood vessel near by, really, no flow is happening, so I'll just write "no flow".
雖然這里有一條血管，但是沒有血液流動
So as the little cell, little toe cells making waste.
那么這個腳趾細胞不斷產生廢物
That waste, let's draw as a little ball right here,
廢物我們畫成圓球的話
it's going to start accumulating, right?
廢料開始不斷累積
You're going to start collecting more and more of it since the blood is not really flowing.
廢料越來越多，因為血液不流動
And it might start kind of getting all the way around our toe cell.
現在腳趾細胞四周都是廢物了
So our toe cell is getting swamped, literally getting kind of covered by its own waste.
這樣下去，腳趾細胞就被自己代謝的廢物淹沒了
And on the flip-side, is it getting oxygen or nutrients? No.
而另一方面，細胞獲得氧氣和養料了嗎？并沒有
It's not getting either of these things.
并沒有得到任何氧氣和養料
So, before very long,
那么，很快
I would say within minutes, our toe cell is thinking,
在幾分鐘之內，腳趾細胞就會發現
Well, this is not a very happy way to live!
這個生存方式不太合理
This is actually really very sad, this is awful.
是非常不合理
And if this continues the toe cell would die.
如果情況持續下去，細胞就會死亡
So, what a toe cell needs, and what every cell needs,
不光是腳趾細胞
and that could be a finger cell or a skin cell,
甚至是手指，皮膚細胞，所有細胞
or really any cell that's living, needs flow.
任何活細胞，都需要血液流動
Right? It needs this blood to be flowing nicely and smoothly.
需要順暢流動的血液
And if there is flow, then you get a very different picture, right?
如果這里有血液的話，情況就非常不同了
If there's flow then all the sudden
如果血管中有血液
all this waste product is actually now lifted and taken away.
那么所有廢物就被帶走了
It's flowing away, and it's a little bit like having someone come by
被血液攜帶走了，這種情況比較像出門扔垃圾
and pick up the trash, then you don't have trash all over the house.
這樣家里就不會堆滿垃圾了
So then you have nice flow, and in return, oxygen and nutrients are delivered.
同時，如果有血液流動的話，也可以運送氧氣和養料了
So this stuff gets delivered as well.
這些也可以被運進來
So, all of the sudden the cell is going to be very, very happy,
這樣，細胞就會非常健康地生存了
and is going to be living just fine.
情況就會非常好
So, really if you want all of the cells in your body to be living just fine like this cell here,
那么，如果想要體內的每個細胞都保持健康的生存狀態
you really want good flow throughout the body.
身體中的血液循環一定要順暢
And so this is really point number one.
這就是第一點
Is that you really need, somehow, to have blood flow moving and pushing blood constantly throught the body.
心臟第一個功能使全身有持續順暢的血液流動
So, to do this for billions and billions of cells
如果數以億計的細胞都需要血液
you would need a pretty powerful pump, right?
身體中就要有一個強大的血液泵來控制
Something that's going to be able to pull in all the blood from the body, and then push it back out.
這個泵要能從身體中把血液抽回來，同時再放出去
And that's what the heart is.
這就是心臟的第一個功能
I mean at its core, that's exactly what the heart is doing.
這就是心臟的核心和本質
