1. Teaching of science 2. - PUPIL TEACHER ROLL NO.- 57952 CLASS- 7th SUBJECT- SCIENCE DATE- 26 TIME- - 3. PREVIOUS KNOWLEDGE TESTING Q.1 What do we need to live? 4. PREVIOUS KNOWLEDGE TESTING Q.1 What do we need to live? Q.2 From where we get oxygen? 5. PREVIOUS KNOWLEDGE TESTING Q.1 What do we need to live? Q.2 From where we get oxygen? Q.3 Which gas we give out during breathing? 6. PREVIOUS KNOWLEDGE TESTING Q.1 What do we need to live? Q.2 From where we get oxygen? Q.3 Which gas we give out during breathing? Q.4 How food and oxygen reaches different parts of the body? 7. Announcement of topic Human circulatory system The heart, blood vessels and the blood 8. Circulatory system Definition: The organ system of the human being which is responsible for the transport of materials inside the body is called circulatory system. 9. Parts of the circulatory system 1 The heart 2 The blood vessels 3 The blood 10. The HEART It is a conical and highly muscular hollow organ situated in the chest. It is approximately equal to the size of fist of left hand. Heart circulate the blood in our body. It consists of the following Parts 1 Chamber 2 Layers of heart 3 valves 11. Four chambers The heart is four chambered structure. 1 Right atrium: The right atrium receives the deoxygenated blood from all parts of the body . It pumps this blood into right ventricle. 2 Right ventricle: it pumps the deoxygenated blood to the lungs 12. FOUR CHAMBER Left atrium: It receives oxygenated blood from the lungs through pulmonary veins. It pumps this blood into the left ventricle. Left ventricle: The left ventricle pumps the oxygenated blood the distant organs in the body. 13. Four chambers Each atrium communicate with the ventricle of its side by a pore which is guarded by valves. This valves allow the blood to flow from the atrium to the ventricle . Thus in the heart there is a complete separation of oxygenated and deoxygenated blood. 14. Layers of the heart wall There are three layers of tissue form the heart wall Epicardium layer: The outer layer of the heart wall is the Epicardium. Myocardium: The middle layer is myocardium. Endocardium: The inner layer is Endocardium 15. Valves of the heart 16. Valves of the heart Bicuspid valve: This valve allow the deoxygenate blood to flow from the right atrium to the right ventricle. Tricuspid valve: This valve allow the oxygenate blood to flow from the left atrium to the left ventricle. 17. Sectional Recapitulation Q.1 the circulatory system consists of the heart , the blood vessels and ---------. 18. Sectional Recapitulation Q.1 The circulatory of the system consists of the heart , the blood vessels and ---------. Q.2 The heart consist of ------------ Chambers. 19. Sectional Recapitulation Q.1 The circulatory of the system consists of the heart , the blood vessels and ---------. Q.2 The heart consist of ------------ Chambers. Q.3 The right atrium receives the ---------- blood. 20. Sectional Recapitulation Q.1 The circulatory of the system consists of the heart , the blood vessels and ---------. Q.2 The heart consist of ------------ Chambers. Q.3 The right atrium receives the ---------- blood. Q.4 The left atrium receives oxygenated blood from the lungs through ------------. 21. The blood vessels 2. Blood Vessels -A network of tubes Arteries- carry the oxygenated blood from the heart to the different regions or organs. Capillaries the capillaries have thin walls so as to enable very tiny molecules to diffuse in and out. The capillaries rejoin to form a vein. Thus a network of capillaries forms the connection between arteries and veins. Veins- veins carry impure or deoxygenated blood collected from the different regions to the heart 22. The BLOOD A. Plasma About 55% of the blood is a pale yellow watery fluid called plasma Plasma consist of in which substances such as glucose, amino acids, sodium, waste product and carbon dioxide are dissolved. 23. The BLOOD B. Red Blood Cells Carry hemoglobin and oxygen. Do not have a nucleus and live only about 120 days. 24. THE BLOOD C. White Blood cells Fight infection and are formed in the Bone - Marro. White blood cell eat up bacteria and germs. The ratio of RBC to WBC is 1:500. 25. The Cardiovascular System The Blood D. Platelets. Platelets are tiny fragments of cells. Platelets help the blood to form clots at a bound side so excessive loss of blood may be prevented 26. FINAL RECAPITULATION Q.1 _______%of the blood is plasma. 27. FINAL RECAPITULATION Q.1 _______%of the blood is plasma. Q.2 Red blood cells carry hemoglobin and ________ . 28. FINAL RECAPITULATION Q.1 _______%of the blood is plasma. Q.2 Red blood cells carry hemoglobin and _______. Q.3 White blood cells are formed in the _______. 29. FINAL RECAPITULATION Q.1 _______%of the blood is plasma. Q.2 Red blood cells carry hemoglobin and ________. Q.3 White blood cells are formed in the _______. Q.4 The veins carry _______ blood collected from different regions to heart. 30. Q.1 Draw a diagram of the human heart and label the various part. Q.2 Differentiate between arteries and veins. 31. Thank you