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5 Major Systems in the Human Body Miss Atkinson 7th Grade Science Class NC Essential Standard Structures and Functions of Living Organisms • 7.L.1 Understand the processes, structures and functions of living organisms that enable them to survive, reproduce and carry out the basic functions of life. • 7.L.1.4 Summarize the general functions of the major systems the human body (Digestion, respiration, reproduction, circulation and excretion) and ways these systems interact with each other to sustain life. What are the five major systems? • Digestive • Respiratory • Reproductive • Circulatory • Excretory Digestive system What is the Digestive System? It is a group of organs that work together to digest food so it can be used by the body. The Digestive Tract is a series of tube like organs in the digestive system.The Digestive Tract includes the mouth, pharynx, esophagus, stomach, small and large intestine, rectum and anus. Respiratory System What is the Respiratory System? It is the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing. What organs make up the Respiratory System? •Lungs •Trachea •Bronchi •Alveoli •Diaphragm •Nose •mouth Reproductive system Reproductive system What is the Reproductive System? organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring. What organs are in the Reproductive System? Vagina Fallopian tubes Uterus Ovaries Penis Testicles Ducts and Glands Circulatory System What is the Circulatory System? The system moves blood through your body to provide oxygen to all your organs and tissues. It is made up of arteries, veins and heart. What is Involved in the Circulatory System? Heart - pumps blood throughout the body* Blood-fluid that brings nutrients and removes waste Blood Vessels - the containers for blood, the tubes Excretory System What is the Excretory System? The Excretory System collects and eliminates wastes from the body and regulates the level of fluid in the body. •What organs make up the Excretory System? •Kidneys •Ureter •Urinary Bladder •Urethra Working Together The respiratory system brings oxygen into the lungs when you breathe. The digestive system breaks food down into nutrients such as glucose. Now the circulatory system enters the picture. It transports glucose and other nutrients from the digestive system to the cells. The circulatory system also transports oxygen from the lungs to the cells. Now the cells have what they need for cellular respiration: oxygen and glucose. The teamwork doesn’t end there, however. The circulatory system also transports carbon dioxide waste from the cells to the lungs of the respiratory system. Through gas exchange in the lungs, the carbon dioxide waste is removed from your body when you breathe out. http://highered.mcgrawhill.com/sites/dl/free/0070722218/699439/SL10_sample_unit1_topic1_4.pdf