1. Do Now What is the strongest muscle in your body?

2. CHAPTER 5 CIRCULATION Miss Sabia https://www.youtube.com/watch?v=EtLKuUdMk5I

3. Standards 1.2f-circulatory system moves materials from one cell to another, responding to changing demands 1.2j-disease??? LE Skill #8-ID pulse points and pulse rates

4. Chapter Project Write a story from the point of view of a red blood cell as it travels through the body.

5. THE BODY’S TRANSPORTATION SYSTEM Section 1

6. Essential Question 1. What is the function of the cardiovascular system? 2. What is the path taken by red blood cells in the body?

7. Cardiovascular System The cardiovascular system, or circulatory system, carries needed substances to cells and carries waste away from cells. Composed of: –Heart –Blood vessels (veins & arteries) –blood

8. Movement of Materials Needed materials: –Oxygen –Glucose –Nutrients (from digestion) Waste materials: –Carbon dioxide

9. The Heart The heart is a hollow, muscular organ that pumps blood throughout the body Each time it pumps, it pushes blood through the blood vessels

10. The Heart’s Structure Left side and a right side, upper chamber and lower chamber Upper chamber: atrium –Receives blood that enters heart Lower chamber: ventricle –Pumps blood out of heart

11. Do Now Label: right atrium, left atrium, right ventricle, left ventricle

12. The Heart’s Structure Atria are separated from the ventricles by valves A valve is a flap of tissue that prevents blood from flowing backward

13. How the Heart Works Contract—pumps blood forward Relax—heart fills with blood A heartbeat (lub-dub) is heard during the pumping phase –Lub—valves close between ventricles and atria –Dub—valves close between ventricles and blood vessels

14. Blood Vessels Arteries: blood vessels that carry blood away from the heart Veins: blood vessels that carry blood back to the heart Capillaries: tiny vessels where substances are exchanged between the blood and body cells (located between veins and arteries)

15. The Path of Blood 1. blood enters heart through vena cava (vein) and goes into right atrium 2. right ventricle 3. pulmonary artery 4. lungs 5. pulmonary vein 6. left atrium 7. Left ventricle 8. Aorta (artery) sends oxygenated blood to rest of body

16. A CLOSER LOOK AT BLOOD VESSELS Section 2

17. Essential Question How do the structures of the different blood vessels aid in their functions?

18. Arteries Thick walls give arteries strength and flexibility Allows them to withstand the pressure of blood pumped by the heart

19. Veins Thinner walls than arteries –don’t need to withstand as much pressure, because they are not receiving blood directly from the heart Blood flows through veins by… –Contraction of nearby muscles helps push blood along in veins –Contain valves that prevent backflow of blood –Breathing movements force blood towards the heart (squeezing pressure)

20. Capillaries Recall… –Capillaries: tiny vessels where substances are exchanged between the blood and body cells (located between veins and arteries) Blood  Cells: –Oxygen –Glucose Cells  Blood: –Cellular waste

21. Pulse You can feel your pulse on the inside of your wrist or on your neck Caused by expansion and relaxation of the artery wall

22. BLOOD AND LYMPH Section 3

23. Red Blood Cells Red blood cells (RBC): take up oxygen in the lungs and deliver it to cells in the body –Produced in the bone marrow Mostly made of hemoglobin, a protein that binds to oxygen molecules –When hemoglobin combines with oxygen, it makes the blood cells bright red

24. White Blood Cells White blood cells (WBC): fight disease –Some recognize disease-causing agents –Some produce chemicals to fight the invaders –Some surround and engulf (and kill) the invaders