On the other end of the capillary bed there's a venule, and the arteriole and venule are usually directly connected by a vessel called the metarteriole.

在毛细血管一端，有静脉；动脉和静脉通常是由一种叫微动脉血管直接连接。

The cells send their CO2 and other junk out to the venal end of the capillary exchange where the capillaries unite into venules, and then merge into veins that head back to the heart.

细胞将二氧化碳和其他垃圾输送毛细血管交换静脉端，毛细血管在那里结合成静脉，然合并成静脉返回心脏。

Interestingly, once the blood leaves these glomeruli it does not enter into venules.

有趣是，当动脉血离开这些肾，并不进入静脉。

The oxygen-rich blood moves into a venule and then, eventually, into a pulmonary vein that dumps the blood into the left atrium.

富含氧气血液汇入静脉，最终进入肺静脉；肺静脉将血液排入左心房。

Loaded up with carbon dioxide, the blood turns that dark red color again (shown as blue) and starts the return journey to the heart by going into small venules and then larger veins.

随着二氧化碳增加，血液会再次变成暗红色（画为蓝色）并开始返回心脏，先是进入静脉，然是较大静脉。

And blood pressure in veins is extremely low compared with pressure in arteries. The smallest veins, called venule , are formed by the union of capillaries.

微静脉 壁略厚于毛细血管壁。随着静脉变大，管壁变厚。

So as we get older, especially at my age, the smooth muscle around our small veins, our venules, They get weak, and our little venules get stiff.

所以随着年龄增长，特别是了我这个年纪，我们静脉周围平滑肌会变弱，而这些静脉也会变得僵硬。