DK did you know human body Amazing answers to more than 200 awesome questions关于人体200多个惊叹答案

Body basics
身体基础
The human body is made up of cells, which contain unique instructions that make you who you are. Each organ in your body has an important job to do, and your blood helps to supply them with everything they need to work.
人体是由细胞组成的，这些细胞含有独特的指令，使你成为真正的你。你身体的每一个器官都有一项重要的工作要做，你的血液帮助它们提供一切所需的工作。

What’s my body made of?
我的身体是由什么组成的？
The smallest living building blocks in the body are cells. There are many different types of cell. The same cells join together to build tissue. Groups of tissues build organs, which work together in organ systems, such as the respiratory system.
人体内最小的活体结构是细胞。有许多不同类型的细胞。同样的细胞结合在一起形成组织。组织群构建器官，这些器官在器官系统中共同工作，如呼吸系统。

Cells
细胞
Cells hold the instructions to make a body; these are written in a coded sequence of chemicals called DNA. The DNA is kept in the nucleus— the center of the cell.
细胞掌握着制造身体的指令；这些被写在一个被称为DNA的化学编码序列中。DNA保存在细胞核中——细胞的中心。

Organ
器官
Organs are body parts that have a job to do. For example, the lungs take oxygen gas from the air and release it into the blood. They also remove carbon dioxide gas from the blood.
器官是有工作要做的身体部位。例如，肺从空气中吸收氧气并将其释放到血液中。它们还能清除血液中的二氧化碳气体。

Organ system
器官系统
Groups of organs work together in organ systems. The lungs are part of the respiratory system. This group of organs works together to help you breathe.
器官群在器官系统中共同工作。肺是呼吸系统的一部分。这组器官共同帮助你呼吸。

The skin! It weighs about 9 lb (4 kg). Each organ in the body is a different shape and size, and each does a different job. The heart pumps blood, the eyes help you to see, and the brain controls everything you do.
皮肤！它重约9磅（4公斤）。身体中的每个器官都有不同的形状和大小，每个器官都有不同的功能。心脏泵血，眼睛帮助你看东西，大脑控制你做的一切。

Skin
皮
The skin keeps your body at a healthy temperature and stops your insides from falling out. It protects you, too, by blocking out water, germs, and the sun’s rays.
皮肤使你的身体保持健康的温度，防止你的内脏脱落。它也通过阻挡水、细菌和太阳光来保护你。

Pineal gland
松果体
The smallest organ in the body is the pineal gland (shown in red). It’s in the brain and it releases a hormone, or chemical messenger, called melatonin into the blood when it gets dark. This helps your body relax so you can sleep
身体中最小的器官是松果体（以红色显示）。它在大脑中，当光线变暗时，它会向血液中释放一种叫做褪黑素的激素或化学信使。这有助于你的身体放松，这样你就可以睡觉了

Kidney
肾
The kidneys clean the blood and balance water in the body. They filter out waste from the blood and help the body remove this waste as urine, or pee. There are two kidneys in the body doing the same job, which means you can survive with just one!
肾脏清洁血液，平衡体内水分。他们过滤掉血液中的废物，并帮助身体清除这些废物，如尿液或小便。体内有两个肾脏做着同样的工作，这意味着你只需要一个就可以存活下来！

What’s smaller than a cell?
什么比一个细胞小？
Cells are the smallest living parts of the body. They contain small floating machines called organelles, each one with a different role. Organelles do important jobs, such as turning food into energy.
细胞是身体最小的活的部分。它们包含称为细胞器的小型浮动机器，每一个都有不同的作用。细胞器起着重要的作用，比如将食物转化为能量。

Organelles
细胞器
Organs are parts of the body with important jobs to do. In cells, the parts with important jobs to do are called organelles. The nucleus and mitochondria are types of organelle.
器官是身体的一部分，有重要的工作要做。在细胞中，有重要工作要做的部分称为细胞器。细胞核和线粒体是细胞器的两种类型。
Membrane
膜
The membrane is the outer layer of the cell. It lets water and chemicals move in and out of the cell, depending on what the cell needs at any given time.
膜是细胞的外层。它可以让水和化学物质进出细胞，这取决于细胞在任何特定时间的需要。

DNA
脱氧核糖核酸
This is a long chain of chemicals that are joined together in a double-helix shape. DNA makes use of four types of chemical to make a code for each part of the body.
这是一条长长的化学链，以双螺旋形状连接在一起。DNA利用四种化学物质为身体的每一部分生成密码。

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