初级组 Lesson 3
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The circulatory system comprises the heart and network of blood vessels. The heart lies in the chest cavity and acts as a double pump to circulate blood throughout the body. Blood carries oxygen, nutrients, hormones and waste products, and is transported via a series of arteries, capillaries and veins. Key functions of circulation include supplying oxygen, regulating temperature, distributing nutrients and collecting waste.
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初级组 Lesson 3
- 1. LESSON 3 The Circulatory System 人体血液循环系统
- 2. The circulatory system: Comprises of the heart and the network blood vessels. Main Functions: 1. Supply oxygen to all parts of the body. 2. Distribute heat 3. Distribute（ 分配）the absorbed nutrients. 4. Collect and carry waste materials to the organs concerned with their discharge.(排出）
- 3. Position and structure of the heart Position: 1. lies in the chest cavity between two lungs. Structure : 1. muscular muscle,acts as double pump. 2. Divided into left and right side.(right : upper collecting , left : lowers pumping)
- 5. The Average heartbeat Adult :60~80/min children:80~100/min Infant:100~120/min The Factor which increase the heartbeat 1. Exercise 2. Fever 3. Emotional Stress 4. The comsumption of alcohol 5. Several bleeding
- 6. The structure and function of blood vessels and Blood Arteries(动脉）*有氧 • Strongest blood vessels • Carry blood away from heart. Capillaries(微血管） • Very small blood vessels • Exchange of fluids and gases to and from tissues of body. Veins(静脉）*无氧 • Very small vessels. • Returninng blood to right chamber heart.
- 7. Blood • Red ,white corpuscles and platelets. • Blood carry nutrient from digestive organs and carry waste products to excretory(排泄） organs. **Red cells carry oxygen **white cells remove germs and dead cells. **platelets help blood clot. The pulse Carotid (颈动脉） Brachial （上臂脉） Radial Femoral（大腿内侧）