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Bone Strength    Bone is both strong and lightweight. Bones can absorb more force without breaking than concrete or granite rock can. Yet bones weigh much less than those materials. In fact, only about 20 percent of an average adult's body weight is bone. Bone feels as hard as a rock because it is made of tightly packed minerals-mainly phosphorus and calcium.  Bone Growth   Because bones are alive, they form new bone tissuw as you grow. Your bones are growing longer now, making you taller. Even after you are fully grown, bone tissue continues to form. For example, every time you play soccer or basketball, some of your bones absorb the force of your weight. They respond by making new bone tissue. New bone tissue also forms when a bone breaks. Bone Development   Because bon Know your bones! Here are some fascinating facts you may not know about your bones:
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Past Tense

Grammar Focus Where were you born?    -I was born in Argentina. Were you born in Mexico City?    -Yes, I was .    - No, I wasn't . I was born in Guadalajara. When did you move to Los Angeles?    -I moved here ten years ago. I didn't speak English. Did you take English classes in Mexico?    -Yes, I did . I took classes for a year.    -No, I didn't . My aunt taught me at home.

HOW TO SAY WORDS ENDING IN -OUGH & -AUGH

In today's lesson, we're going to look at words that generally confuse people, especially when it comes time to say them, words that have the "OUHG" or the "AUGH" inside them.    And the reason they're confusing is because they don't sound anything like they look. This is a common problem in English. But WHY? Because English is not a phonetically-spelled language. In other languages, the way a word looks is the way it sounds. In English, not so much!  Now, I need to say something before started. This lesson is about memorization . I'm sorry but sometimes memorizating is a mandatory stuff. If you want to speak like an American you have to say it like this. Why? I don't know. I'm sorry to tell you that. There's no answer... We have 8 different sounds for "ough" or "augh".  UFF: Tough Rough Enough Slough* OO: Through Ghoul Slough* AFF: Laugh Draught UP: Hiccough OF: Cough Trough OW

What are the Characteristics of Bones?

The word skeleton comes from the Greek words meaning "a dried body." This suggests that a skeleton is dead, but bones are not dead at all. Bones are complex living structures that grow, develop, and repair themselves. Bones are also strong and lightweight. Bones are made up of bone tissue, blood vessels, and nerves. A thin, tough outer membrane covers all fo a typical bone except the ends. Beneath the membrane is a thick layer of compact bone , which is hard and dense but not solid. Compact bone contains minerals that give bones strength. Small canals in the compact bone carry blood vessels and nerves from the bone's surface to its living cells. Long bones, such as the femur, have a layer of spongy bone at the ends and under the compact bone. The small spaces withing spongy bone make it lightweight but still strong. Bone also has two types of soft connective tissue called marrow. Red bone marrow fills the spaces in some of your spongy bone. It produces most

What Role Do Joints Play?

What Role Do Joints Play?  If your leg had only one long bone, how would you get out of bed? Luckily, your leg has many bones so you can move it easily. A joint is a place where two bones come together. Joints allow bones to move in different ways. You have two kinds of joints: immovable and movable. Immovable Joints   Immovable joints connect bones but allow little or no movement. The bones of the skull are held together by immovable joints. Movable Joints   Most joints are movable. They allow the body to make many different movements such as those shown in the picture . The bones in movable joints are held together by ligaments , which are made of strong connective tissue. Took from: Human Body Systems; Interactive Science. Don Buckley, M. Sc....  Pearson 2011. 

Lesson 1. The Skeletal System

What does the Skeleton Do?  If you have ever visited a construction site, you have seen workers assemble steel pieces into a rigid frame for a building. Once the building is finished, this framework is invisible. Like a building, you have an inner framework. Your framework or skeleton , is made up of all the bones in your body. Just as a building would fall without its frame, you would collapse without your skeleton. Your skeleton have five major functions. It provides shape and support, enable you to move, and protects your organs It also produces blood cells and stores minerals and other materials until your body cells and stores minerals and other materials until your body needs them.  Shape and support   Your skeleton shapes and supports your body. It is made up of about 206 bones of different shapes and sizes. Your backbone, or vertebral column, is the center of your skeleton. A total of 26 small bones, or vertebrae (VUR tuh bray) (singular vertebra), make up your backbone