Name: 血細胞系 (Blood cell lineages)
Uploaded: 2021-01-14T06:32:26.000Z
Duration: 8 min 4 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

- [Voiceover] So, let's draw a blood vessel.

travelling around in all the blood vessels of the body.

You've also got something called a macrophage.

which is what we're gonna address in this video,

is where do all these blood cells come from?

Because all these blood cells in the body

And here's the bone marrow that I'm drawing here.

Now, actually it turns out that they don't come

Some of those places are the head of, for example,

the femur, which is the long bone in your thigh.

And they also come from something called flat bones.

Flat bones, such as the one I'm drawing here,

The sternum is the flat bone in your body

which is interesting and which was not always known,

it turns out that all these blood cells in your body

And I'll draw him here. So, here he is. He's purple.

And the reason that he's called pluripotent

are sort of undifferentiated cells that can give rise

the myeloid lineage and the lymphoid lineage.

The myeloid lineage gives rise to red blood cells,

They are the most common of all blood cells.

Now, the myeloid lineage also gives rise to

Now, you might have never heard of this before,

which actually bud off of the megakaryocytes like this.

They kind of squeeze out little pieces of cytoplasm

that likes to eat up invaders like bacteria,

the myeloid lineage or the lymphoid lineage?

they actually come from the myeloid lineage.

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血細胞系 (Blood cell lineages)

immune

draw

flat

give