Review of the Human Body Systems Created by Mrs. Wallace Body Systems Skeletal System Muscular System Circulatory System Digestive System Nervous System The Skeletal System What would happen if humans didn't have bones? You'd be floppy like a beanbag. Could you stand up? Forget it. Could you walk? No way. Without bones you'd be just a puddle of skin and guts on the floor. The Skeletal System works with the Muscular System to move your body How do my bones move? With a lot of help. You need muscles to pull on bones so that you can move. Along with muscles and joints, bones are responsible for you being able to move. Your muscles are attached to bones. When muscles contract, the bones to which they are attached act as levers and cause various body parts to move. The Muscular System Muscles are the part of our body that allow us to move. They make up almost half of the weight of our bodies. They are made up of special tissues.When brain gives QuickTime™ and a TIFF (Un compressed) decompressor muscles a signal, those tissues are neede d to se e this picture. can contract, or shorten. The muscles are attached to bones by tendons. Tendons pull on the bones and cause our limbs to move. Types of Muscles Smooth Caridac Skeletal Type Title Here Type Title Here Type Title Here Pictures of Muscle Types Cardiac Muscles Skeletal Muscles Smooth Muscles Smooth Muscles Smooth muscles are sometimes also called involuntary muscles and they are usually in sheets, or layers, with one layer of muscle behind the other. You can't control this type of muscle. Your QuickTime™ an d a TIFF (Uncompressed) decompressor brain and body tell these muscles what to do without you even are need ed to see this p icture . thinking about it. You can't use your smooth muscles to make a muscle in your arm or jump into the air. Cardiac Muscle The muscle that makes up the heart is called cardiac muscle. It is also known as the myocardium (say: my-uh-kar-dee-um). The thick muscles of the heart contract to pump blood out and then relax to let blood back in after it's circulated through the body. Just like smooth muscle, cardiac muscle works all by itself with no help from you. A special group of cells within the heart are known as the pacemaker of the heart because it controls the heartbeat. QuickTime™ and a TIFF (Uncompressed) decompre ssor are neede d to see this picture. Skeletal Muscles Skeletal muscles are voluntary muscles, which means you can control what they do. Your leg won't bend to kick the soccer ball unless you want it to. Skeletal Muscles Together, the skeletal muscles work with your bones to give your body power and strength. In most cases, a skeletal muscle is attached to one end of a bone. It stretches all the way across a joint (the place where two bones meet) and then attaches again to another bone. Skeletal Muscles Skeletal muscles are held to the bones with the help of tendons (say: ten-dunz). Tendons are cords made of tough tissue, and they work as special connector pieces between bone and muscle. The tendons are attached so well that when you contract one of your muscles, the tendon and bone move along with it. Muscular System Song Muscles of three types you'll find Skeletal, smooth, and the cardiac kind. Skeletal muscles come in pairs with the bones you’ll find them there Workin’ together to make you strong, one gets short while the other long, like your arm when muscles flex, Biceps short and long triceps Chorus: Your heart is a muscle too, Skeletal type working like a smooth, A specialized muscle called the cardiac, But your skeletal muscles go right up your back If you’ve ever navigated on the Erie Canal Voluntary muscles all Striated, the skeletal Tendons at the bones connect With the joints so they can flex Involuntary are the kind That move with no choice from your mind Like your stomach with muscles smooth And in the walls of blood vessels too *Click the link to hear music and lyrics Fun Facts about Muscles… You have over 30 facial muscles which create looks like surprise, happiness, sadness, and frowning. Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day! The largest muscle in the body is the gluteus maximus muscle in the buttocks. The Circulatory System Made up of the heart, blood and blood vessels, the circulatory system is your body's delivery system. Blood moving from the heart, delivers oxygen and nutrients to every part of the body. On the return trip, the blood picks up waste products so that your body can get rid of them. The Circulatory System Fun Facts! One drop of blood contains a half a drop of plasma, 5 MILLION Red Blood Cells, 10 Thousand White Blood Cells and 250 Thousand Platelets. You have thousands of miles of blood vessels in your body. "Bill Nye the Science Guy" claims that you could wrap your blood vessels around the equator TWICE! Keep your heart healthy...it's going to have to beat about 3 BILLION times during your lifetime! The Digestive System When you eat, your body digests the food so your cells can use it to make energy. Acids and enzymes eat away at the surface of food to break it down. The small intestine is where food is QuickTime™ a nd a TIFF (Uncompressed) decompressor are need ed to see this picture. broken down into molecules tiny enough for the body cells to use. In the villi are tiny tubes that carry blood called VESSELS. Food molecules are taken into these blood vessels. Once the food is in the blood, it can travel all over the body. Digestive System Fun Facts! HOW LONG ARE YOUR INTESTINES? At least 25 feet in an adult. Be glad you're not a full-grown horse -- their coiled-up intestines are 89 feet long! Chewing food takes from 5-30 seconds Swallowing takes about 10 seconds Food sloshing in the stomach can last 3-4 hours It takes 3 hours for food to move through the intestine Food drying up and hanging out in the large intestine can last 18 hours to 2 days! In your lifetime, your digestive system may handle about 50 tons!! The Nervous System Made up of your brain, your spinal cord, and an enormous network of nerves that thread throughout your body, it's the control center for your entire body. Your brain uses information it receives from your nerves to coordinate all of your actions and reactions. Without it, you couldn't exist! Nervous System Fun Facts! Did you know that you have more sensory neurons in your tongue than in any other part of your body? Many of the drugs that neuroscientists use to study the nervous system are from toxic plants and venomous animals such as snakes, spiders, snails and pufferfish. Human neurons are so small you have to use a microscope to see them. However, some neurons can be up to three feet long.