1. + Circulatory System

2. + Do Now Why is it important for your heart to continue beating even when you’re sleeping? What does your body need? What are some wastes?

3. + Function of the Circulatory System Pump blood throughout the body The circulatory system transports substances including oxygen, nutrients and wastes to and from cells Uses diffusion (from high to low concentration along concentration gradient).

4. + TRIVIA! The function of the circulatory system is to … a. chemically break down food b. absorb nutrients c. pump blood through the body d. none of the above

5. + Circulation and Respiration Each breath brings oxygen rich air into your body Your cells need that oxygen to make ATP Your heart delivers oxygen to your cells Working together, your circulatory and respiratory systems supply cells throughout the body with the nutrients and oxygen that they need to stay alive!

6. + Structure The human circulatory system consists of: The heart A series of blood vessels Blood that flows through them

7. + Blood Flow through the heart Blood leaves the heart in ARTERIES (oxygenated blood) Blood returns to heart in VEINS (de- oxygenated)

9. + Blood vessels Blood circulates in one direction and is moved by the pumping of the heart As blood flows through the circulatory system, it moves through three types of blood vessels: Arteries (Aorta)-  Artrioles (smaller) Veins Capillaries LARGEST -> smallest Aorta  veins  arteries  arterioles  capillaries

10. + TRIVIA The smallest of the blood vessels are the a. arteries b. veins c. capillaries d. aorta

11. Arteries Large vessels that carry blood away from the heart to tissues of the body Oxygenated blood

12. Veins Return blood to the heart Deoxygenated blood

13. Capillaries The smallest of the blood vessels connecting arteries and veins Walls are one cell thick allowing for easier diffusion of oxygen from capillaries to body cells and and carbon dioxide from body cells to capillaries

14. + Blood Blood is composed of several parts: 1) plasma: yellow liquid medium: fluid that is 90% water. Cells receive nourishment from substances in plasma 2) red blood cells: transport O2 and remove waste (CO2) 3) white blood cells - fight germs and disease 4) platelets - stop bleeding/help blood clot

15. + Red Blood Cells -made in your bone marrow - transport oxygen collected from alveoli -Remove carbon dioxide waste from cells to the alveoli - Contain HEMOGLOBIN which is a protein that binds with oxygen -Blood is RED because of hemoglobin

16. + Trivia! The iron-containing molecule in the red blood cells is called a.plasma b.hemoglobin c.ferric oxide d.carbonic acid

17. + TRIVIA! Red blood cells... a.transport respiratory gases b.destroy viruses c.combat bacterial infection d.transport cholesterol

18. + White Blood Cells -made in your bond marrow - fight off bacterial infections

19. + TRIVIA! Defending the body against bacterial infection and invasion by foreign substances is a function of... a.red blood cells b.platelets c.plasma d.white blood cells

20. + Circulatory, Repsiratory, and Digestive Systems Each breath brings oxygen rich air into your body Each breath brings oxygen rich air into your body Nutrients come from digested food from digestive system Nutrients come from digested food from digestive system Your cells need that oxygen to make ATP Your cells need that oxygen to make ATP Your heart delivers oxygen to your cells Your heart delivers oxygen to your cells Working together, your circulatory and respiratory systems supply cells throughout the body with the nutrients and oxygen that they need to stay alive! Working together, your circulatory and respiratory systems supply cells throughout the body with the nutrients and oxygen that they need to stay alive!