1 Cells to Organ System

CELLS TO ORGAN SYSTEMS

细胞到器官系统

WHAT ARE CELLS? Hi there! I'm a cell! A cell is the basic unit of life. In fact, you might call cells the building blocks of life! All living things are made up of cells. Some living things are made up of only one cell. Like this bacterium! But some plants and animals are made up of many cells. Humans are animals, too!

什么是细胞？大家好!我是一个细胞！细胞是生命的基本单位。 事实上，你可以把细胞称为生命的基石！所有的生物都是由细胞组成的。 有些生物仅由一个细胞组成。 就像这个细菌！但是一些植物和动物是由许多细胞组成的。 人类也是动物！

The human body has more than 10 trillion cells! Most cells are so tiny you can't see them without a microscope. SEE?! It takes millions of cells to make up the skin on the palm of your hand! Just like you, a cell "breathes," takes in food, and gets rid of wastes. Cells also grow and reproduce, or create their own kind. And, just like other organisms... ...cells die!

人体有超过10万亿个细胞！大多数细胞都很小，没有显微镜是看不见的。 看到了吗? !手掌上的皮肤是由数百万个细胞组成的！就像你一样，细胞也会“呼吸”，吸收食物，排出废物。 细胞也会生长和繁殖，或者创造自己的同类。 而且，就像其他生物一样…… ．．．细胞死亡!

GROWTH Do you know one of the most amazing things about you? At one time, you were a single cell. When a human egg cell... ...was fertilized by a human sperm cell... ...the resulting cell had all the instructions to make all of you. That cell divided and grew, and each resulting cell had its own complete set of instructions. Over time, some cells changed and took on different jobs.

你知道你最令人惊奇的事情之一吗？ 你曾经是一个单细胞。 当一个人类卵细胞... ...被人类精子受精… ．．．由此产生的细胞拥有制造你们所有人的所有指令。 细胞分裂生长，每个细胞都有自己完整的指令。 随着时间的推移，一些细胞发生了变化，承担了不同的工作。

Some cells became your eyes... Some cells became your nose... Some cells became your fingers... After about nine months, you were born—a baby human! Your cells will continue to divide throughout your life. That's how your body grows and repairs itself.

一些细胞变成了你的眼睛…… 有些细胞变成了你的鼻子…… 有些细胞变成了你的手指…… 大约九个月后，你出生了——一个人类婴儿！你的细胞会在你的一生中继续分裂。 这就是你的身体生长和自我修复的方式。

KINDS OF CELLS All animal cells share certain characteristics. But different cells do different jobs. As you read these words, nerve cells in your eyes are carrying messages of what you are reading to your brain cells. Muscle cells attached to your eyeballs are moving your eyes across the page. SEE?!

细胞的种类所有的动物细胞都有某些共同的特征。 但是不同的细胞做不同的工作。 当你读这些文字时，你眼睛里的神经细胞将你所读的信息传递给你的脑细胞。 附着在眼球上的肌肉细胞使你的眼睛在书页上移动。 看到了吗? !