5 The Digestive And Urinary Systems

THE DIGESTIVE AND URINARY SYSTEMS

消化系统和泌尿系统

WHY EAT? Do you know why you have to eat? Or drink water? Food and water give your body the materials it needs to live and grow! But before your body can use these materials, the food must travel through a set of organs inside your body. The digestive system includes all of the organs that work to break down food.

为什么吃什么?你知道你为什么要吃东西吗？ 还是喝水？食物和水给你的身体提供生存和生长所需的物质！但在你的身体能够利用这些物质之前，食物必须通过你体内的一系列器官。 消化系统包括所有分解食物的器官。

The human body is made up of trillions of tiny cells. Each of these cells needs food to live. Your digestive system breaks down food into pieces small enough for your cells to use. As cells use food, they produce wastes. These wastes must be removed from the body. The urinary system includes the organs that work together to remove these wastes!

人体是由数万亿个微小的细胞组成的。 这些细胞都需要食物才能生存。 你的消化系统会把食物分解成足够小的碎片供你的细胞使用。 当细胞使用食物时，它们会产生废物。 这些废物必须从体内排出。 泌尿系统包括一起工作来清除这些废物的器官！

NUTRITION Food contains many different chemicals. But only a few dozen of these chemicals are needed to keep you healthy. These few dozen are called nutrients. Let's look at some of the main kinds of nutrients! Proteins are one of the most important building blocks of the body. They make up a large part of each cell in the body. Your muscles and skin are mostly proteins. Fats and carbohydrates provide energy. Your body needs energy to run, walk, sit, sleep, and even think and digest.

食物含有许多不同的化学物质。 但这些化学物质只需要几十种就能保持你的健康。 这几十种被称为营养物质。 让我们来看看一些主要种类的营养素！蛋白质是人体最重要的组成部分之一。 它们构成了人体每个细胞的很大一部分。 你的肌肉和皮肤主要是蛋白质。 脂肪和碳水化合物提供能量。 你的身体需要能量来跑步、走路、坐下、睡觉，甚至思考和消化。

Your body gets this energy by breaking down fats and carbohydrates, along with proteins. Vitamins and minerals are needed for growing and repairing parts of the body. They also take part in many chemical processes in the body. Each vitamin and mineral does a different job. About two-thirds of your body is made up of water, a vital substance that helps keep your body working properly. Your digestive system makes sure all of these nutrients get absorbed by the body so that they can be used!

你的身体通过分解脂肪、碳水化合物和蛋白质来获取能量。 维生素和矿物质是身体各部分生长和修复所必需的。 它们还参与体内的许多化学过程。 每种维生素和矿物质都有不同的作用。 你的身体大约三分之二是由水组成的，水是一种重要的物质，可以帮助你的身体正常工作。 你的消化系统确保所有这些营养物质被身体吸收，这样它们就可以被利用了！

DIGESTION Your body uses nutrients to perform many different tasks. Some nutrients help the body grow and repair itself. Others help your brain and other parts of the body to work! Still others provide the energy needed for your body to perform all of its functions.

你的身体利用营养物质来完成许多不同的任务。 一些营养物质有助于身体生长和自我修复。 其他的帮助你的大脑和身体的其他部分工作！还有一些为你的身体提供所有功能所需的能量。