Saint Pedro Poveda College Junior High School Department S.Y. 2019 – 2020 Science and Technology 9 Session 1 C.N. __19___ Name: _____Anya Garcia_____________________________________________ Grade 9 - D_____________ CIRCULATORY SYSTEM I. Identify the parts of the human heart. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. ___superior vena cava____________ ____right pulmonary artery_________ ____right pulmonary veins_____________ ____pulmonary valve_________________ ____right atrium___________________ ____tricuspid valve___________________ ____right ventricle___________________ ____inferior vena cava________________ ____arteries______________ ____aorta______________ ____left pulmonary artery_____________ ____left pulmonary veins______________ ____left atrium_____________________ ____bicuspid valve_________________ ___aortic valve_______________ ____left ventricle______________ ____interventricular septum___________ II. Complete the following scheme of blood circulation in the human body. Oxygen-poor blood enters the right atrium through the tricuspid valve to the ____right ventricle_______ . Through the _____pulmonary____ valve, blood is pumped to the pulmonary trunk then to the ____left pulmonary artery___ reaching capillary beds of the lungs. From the lungs, oxygen rich blood goes and enters to the _pulmonary veins_____ to the __left atrium___ of the heart then through the __bicuspid_______ valve to the chamber called____left ventricle______. Oxygen rich blood will exit the heart through the ___aortic________ valve to the largest artery called ___aorta___. Blood will reach the systemic arteries to the ____capillaries________ of the tissues to the systemic veins to the ___superior vena cava______ and ____inferior vena cava_______ returning to the right atrium of the heart. III. Identify the different types of blood vessels in the picture. blood back the heart blood from the heart e. b. d. c. a. b. c. d. e. veins venules capillaries arterioles arteries IV. Answer the following questions briefly. 1. What is the function of the heart? Explain your answer in 3 to 5 sentences. The main function of the heart is the central pump for blood to circulate throughout the body. It pumps deoxygenated blood to the lungs for oxygenation, which returns to the heart. Oxygenated blood in the heart is pumped from the left ventricle to the different parts of the body to be used by different organs, tissues and cells. Deoxygenated blood returns to the heart in the right atrium. 2. Differentiate the roles of pulmonary and systemic pathways. The pulmonary blood vessels are the pathways of blood that is carried to and from the lungs for oxygenation of the blood. The pulmonary arteries carry deoxygenated blood to the lungs for gas exchange, while pulmonary veins bring it to the heart. Systemic pathways are used for the transportation of oxygenated blood to other parts of the body for oxygen to be used, and deoxygenated blood to return to the heart. 3. Identify the four different valves found in the human heart. What is the function of these valves? The four valves in the human heart are the pulmonary, aortic, tricuspid and bicuspid valves. The pulmonary and aortic valves are those opened by the pressure from the contraction of the ventricles. The tricuspid and bicuspid valves are located between the atrium and ventricles for both left and right sides. Both the tricuspid and bicuspid valves contain muscular fibers that prevent them from opening the wrong way when blood is pumped. 4. Identify the differences between arteries and veins according to its structure and function. Arteries are thicker blood vessels that carry blood from the heart to other parts of the body. They branch out into arteries, and have higher blood pressure than veins. Veins carry blood from the lungs and other parts of the body to the heart. From capillaries, venules branch into veins. 5. What is the sound produced by your heart? What does this sound mean? The sound produced by the heart is “lub-dub.” The lub sound comes from the closing motion of the tricuspid and bicuspid valves. The dub sound is from the vibrations of the closing of the pulmonary and aortic valves.