Holly's+Science

=The Human Body=

The Muscular and Skeletal system 1. The real name for your jaw is mandible and your collar bone is really your clavicle. 2. You are born with about 300 bones, but when you get older they bond together and leave you with about 205 when you are an adult. 3. There are three diffrent types of muscles. Smooth, Cardiac and Skeletal. 4. There are about 650 muscles in your body and with out muscles you couldn't live. 5. The part with the most bones in your body is your feet.



The Digestive system 1. Your digestive system starts when you first smell or see food because it gets saliva in your mouth. 2. Did you know that the small intestine is 22 feet long but 1 inches wide and the large intestine is 5 feet long and 3 inches wide? 3. The acid in your stomach is so strong that it breaks pieces of food into liquid. 4. There are little finger like things in your small intestine called villi that take energy from your food and give it to other parts of the body. 5. You can eat upside down because it is not gravity that gets the food to the stomach, the esophagus pushes it down. The Circulatory 1. There are four different rooms in your heart, the left Atrium, the right Atrium, the left Ventricle and the right Ventricle. 2. When your blood is blue it goes to the lungs and turns red when it gets air then it goes to different parts of the body. 3. The Aorta is a very important part of the heart. It gets blood to the veins and arteries giving blood to the other parts of the body. 4. Blood is made up of mostly Plasma, red blood cells and white blood cells. 5. You don't have a lot of white blood cells but they are very important, they try to kill viruses but when are sick you are low on white blood cells. Tip A good way to remember veins and arteries is ve**IN**s go **IN**to the heart and **A**rteries go **A**way from the heart. The Excretory/Urinary system 1. This system has parts including your bladder, urethra, ureter, kidneys and muscles. 2. The kidney's job is to filter the liquid and makes sure that it is waste. 3. The ureter is attached to the kidneys and it takes the waste to the bladder. 4. The bladder gets a little bit of liquid about every 10 minutes and when it gets full it sends a message to the brain that you have to "go". 5. When the doctors give you a cup and ask you to go to the bathroom it is because they want to make sure your kidneys are working right. Tip A way to remember what the urethra does is when the urethra lets the urine out you say **A**h like urethr**A.** The Respiratory system 1. Alveoli take the air, store it in the lungs and turn into co2. 2. The left lung is smaller than the right lung because if they were the same size there would be no space in between. 3. The pharynx is a little door that makes sure the food goes down the trachea and not the esophagus. 4. The diaphragm is a muscle that goes up and down making you inhale and exhale. 5. You breath your whole life from birth till death even tough you never think about it.