Cell is a basic unit of all living things Life processes
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SCIENCE ( only informations )
- Bu sahifa navigatsiya:
- constellations
- heart muscle A crack or a break in a bone is called a fracture
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supernova
Stars that explode into supernovas sometimes collapse into very dense stars stars called neutron stars A black hole is a region in space that was once occupied by a star A large group of stars and other bodies in space is called a galaxy The Milky Way is a spiral galaxy All galaxies aren’t spiral-shaped. Two other types of galaxies have been discovered. One of these is the elliptical galaxy An irregular galaxy doesn’t have a definite shape or size. Ancient people saw patterns in groups of stars and gave them names. Today we call these star patterns constellations CHAPTER 13 The skeleton is the system of bones that supports and protects the body and the organs inside it Head bones are includes two types of bones. They are bones of the face and bones that protects the brain. These bones are joined together and form the skull The center of bones contains a soft material called bone marrow When humans were born, their skeleton was made of a soft, bonelike material that bends. This material is called cartilage The place where two or more bones are joined together is called a joint Bones are held together at joints by strong cords of tissue called ligaments The kind of joint that allows the most movement of bones is a ball-and-socket joint A hinge-joint allows bones to move back and forth A pivot joint allows for movement from side to side The kind of joint between bones that can’t move is called a fixed joint Muscules are attached to bones by tough cords called tendons The muscles that you can control are in a group called voluntary muscles Muscles that you can’t control are in a group called involuntary muscles Most muscles that move bones are made of long fibers. These are voluntary muscles called skeletal muscles The involuntary muscles that make up most body organs are another kind of muscle. They are called smooth muscles A third kind of muscle is found in the heart. This special kind of muscle called heart muscle A crack or a break in a bone is called a fracture Usually when a bone breaks it doesn’t push through the muscle and skin. This is called a simple fracture Sometimes the broken end of a bone pushes through the muscle and skin. This is called a compound fracture A sprain is an injury in which a ligament is stretched or torn. A muscle strain is an injury caused by over-stretching a muscle or tendon. A cramp is a sudden strong contraction of a muscle CHAPTER 14 The circulatory system is one of the body’s transports systems The liquid part of the blood is called plasma Download 36.5 Kb. Do'stlaringiz bilan baham: 
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