Life Sciences Gr.10 Lesson 54 Transport system Blood circulation system.pptx

life science animal tissues ppt

1. Life Sciences Grade 10 Topic: Transport system Sub-topic: Blood circulatory system Lesson 54 Presenter: Ntombi Dladla

2. Transport systems Large animals require a transport system to get food and oxygen to the body and cells. A transport system must also move carbon dioxide and nitrogenous wastes away from the body cells. The human circulatory system transports these substances via the blood stream.

3. Open circulatory system Arthropods and mollusks have an open circulatory system since the blood is not confined to blood vessels only. They have blood-filled spaces called haemocoels (blood cavity). Organs are found within the haemocoels. These organs become submerged with blood and in this way, obtain oxygen and food from the blood by diffusion. Carbon dioxide and nitrogenous wastes diffuse out of these organs and are transported away by the blood.

4. Closed circulatory system All vertebrates, including mammals have a closed circulatory system. Blood is confined to blood vessels only, which are arteries, veins and capillaries.

5. Double circulation Double circulation describes the fact that  blood flows twice in the heart before it completes one full round . One is pulmonary circulation and the other is systemic circulation. Pulmonary circulation starts from the pulmonary artery which divides into two branches which enter the respective lungs.

6. The human heart Location: The heart is found in the middle of the chest (thoracic) cavity within the ribcage. It lies behind the sternum and is situated more to the left .

7. External structure of the heart

8. External structure of a real heart

9. External structure of the heart

10. Deoxygenated blood refers To blood that has more Carbon dioxide than oxygen . Oxygenated blood is blood That has more oxygen than Carbon dioxide. Oxygenated and deoxygenated blood

11. External structure of the heart with functions

12. ACTIVITIES

13. Activity 1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1 to 1.4) in your ANSWER BOOK. 1.1 Atria pump blood to the. . . A arteries. B body cavities. C veins. D ventricles.   1.2 In the human heart, the thickest wall occurs in the …  A left ventricle. B right atrium. C left atrium. D right ventricle.

14. Activity 1 1.3 In a closed circulatory system, blood flows from arteries into …   A venules. B body spaces. C capillaries. D lymph vessels. 1.4 The valve that separates the left atrium from the left ventricle … A septum B bicuspid valve C semi-lunar valve D tricuspid valve

15. Activity 2 A G F E D C B A G F E D C B Give the correct biological term for each of the following descriptions. Write only the term next to the question number (2.1 to 2.4) in your ANSWER BOOK. 2.1 The strong, double-walled sac covering the human heart 2.2. Thick muscular wall that separates the left side from the right side of the heart. 2.3. Arteries that supply the walls of the heart with oxygen and nutrients. 2.4. The upper chambers of the heart. 2.1 Pericardium  2.2 Septum  2.3 Coronary  Arteries 2.4 Atria 

16. Activity 3 A G F E D C B A G F E D C B Column I Column II 3.1 Carries blood to the heart. A. Veins B. Arteries 3.2 Receives oxygenated blood from the lungs. A. Right Ventricle B. Right Atrium 3.3 Carries Deoxygenated blood to the lungs. A. Pulmonary Vein B. Pulmonary Artery 3.4 Carries blood from the upper parts of the body to the heart. A. Superior Vena Cava B. Inferior Vena Cava 3.5 Double circulatory system involves   A. Pulmonary Circuit B. Systemic Circuit   None B A BOTH A and B

17. Activity 4 Label the External Structure of the Heart . A- Aorta  B- Superior Vena cava  C-Right Atrium  D-Coronary artery  E-Inferior Vena Cava  F-Ventricle Wall  G- Pericardium  H- Coronary Vein  I- Left atrium  J- Pulmonary veins  K- Pulmonary artery 