Inside Your Body

Inside Your Body, written by Kira Fried. Illustrated by Cindy Hill.

《你的身体里》，作者：基拉·弗里德，绘者：辛迪·希尔。

Introduction. The human body is an amazing machine. It has many parts that form systems. The systems work together to keep you alive and healthy. Let's look at some of your body's systems.

导言： 人体是一台奇妙的机器， 它有许多组成系统的部位。 这些系统协同工作，维持你的生命和健康， 我们一起来看看你身体的几个系统吧。

Skeletal System There are 206 bones in your body that make up your skeleton. Your bones give your body shape and strength. They also protect your inner organs. Most of the bones in your body are linked together at joints. There are different kinds of joints. Different joints let body parts move in different ways.

骨骼系统 你的身体里一共有206块骨头，它们构成了你的骨骼。 骨头支撑你的身体轮廓，赋予你力量。 它们还能保护你的内脏器官哦。 你身体里的大部分骨头都通过关节连接在一起。 关节有很多种。 不同的关节能让身体部位做出不同的动作。

The joint that joins your arm and shoulder lets your arm rotate. The joints at your elbows and knees let your lower arms and legs move up and down. If it were not for moving joints, you could not walk, run, and swim.

连接你的手臂和肩膀的关节可以让你的手臂旋转。 你的手肘和膝盖处的关节可以让你的小臂和小腿上下活动。 要是没有可以活动的关节，你就没法走路、跑步，也没法游泳啦。

Muscular system. Muscles control the movement of your body. There are three kinds of muscles. Skeletal muscle is the muscle that is attached to bones. It makes your arms, legs, fingers, eyes, and other body parts move. Cardiac muscle is the strong heart muscle. It works around the Smooth muscle is found in your skin, stomach, and other organs.

肌肉系统 肌肉控制着你身体的所有动作， 肌肉一共有三种。 骨骼肌是附着在骨骼上的肌肉， 它支配你的手臂、腿、手指、眼睛及其他身体部位活动。 心肌是强健的心脏肌肉， 它一刻不停工作。 平滑肌存在于你的皮肤、胃和其他器官当中。

Nervous System Your brain and thousands of miles of nerve fibers form your body's communication system. The brain is the control center. It receives information from your sense organs, eyes, nose, ears, tongue, and skin. The brain tells muscles what to do. If your fingers go near something hot, a signal goes to the brain. It then sends a signal to tell your hand to move away.

神经系统中， 你的大脑和数千英里长的神经纤维组成了你身体的通信系统。 大脑是控制中枢。 它接收来自感觉器官（眼睛、鼻子、耳朵、舌头和皮肤）的信息。 大脑向肌肉下达指令。 要是你的手指碰到了烫的东西，信号就会传到大脑。 然后大脑会发出信号，让你的手立刻缩开。