1. The Systems of the Human Body

2. What are the Human Body Systems We Have Studied So Far?  Skeletal  Muscular  Digestive  Respiratory  Now…  Circulatory  Nervous  Immune

3. The Circulatory System

4. Is Blood Blue?  Blood is a bright red in its oxygenated form (i.e., leaving the lungs), when hemoglobin is bound to oxygen to form oxyhemoglobin. It's a dark red in its deoxygenated form (i.e., returning to the lungs), when hemoglobin is bound to carbon dioxide to form carboxyhemoglobin.  Veins appear blue because light, penetrating the skin, is absorbed and reflected back to the eye.

5. Functions of the Circulatory System (Blood) 1. Carries oxygen (O ₂ ) from the lungs to all of your body cells (RBC’s) 2. Helps the body get rid of waste products (CO ₂ ) 3. Transports nutrients to cells 4. Fights infections & heals wounds (WBC’s & Platelets)

6. The Composition of Blood  The Plasma (Fluid) makes up 55% of the blood volume.  The Solids (Cells) make up 45% of the blood volume.

7. Composition of Blood  97% Water  Other 3% -Antibodies and Proteins - Nutrients and Wastes  Red Blood Cells -Carry oxygen -Contain Hemoglobin  White Blood Cells -Attack bacteria & other invaders  Platelets -Control the blood clotting process PlasmaBlood Solids

8. 3 Types of Blood Vessels 1. Arteries (Away) - The Aorta is the largest artery 2. Veins - The Vena Cava is the largest vein 3. Capillaries - Very Small - Site of O ₂ & CO ₂ exchange - Connect Veins & Arteries

9. Lungs Body cells Our circulatory system is a double circulatory system. This means it has two parts parts. the right side of the system deals with deoxygenated blood. the left side of the system deals with oxygenated blood.

10. Structures of The Heart Left Ventricle Left Atrium Right Atrium Right Ventricle valve Vein from Lungs Artery to Head and BodyArtery to Lungs Vein from Head and Body valve

11. Types of Circulation  Coronary  Within the heart  Pulmonary  Flow of blood from the heart to the lungs  Systemic  Blood moving to other parts of the body

12. Pathway of blood

13. Blood Circulation Animation  https://www.youtube.com/watch?v=mH0QTWzU-xI https://www.youtube.com/watch?v=mH0QTWzU-xI

14. Where is pressure the greatest?  Veins or Arteries? Why?

15. Blood Pressure  Blood pressure is the force of the blood pushing against the walls of the arteries.

16. Blood Pressure  There are two kinds of numbers that make up a blood pressure reading. These numbers are written like a fraction -- the top number refers to systolic blood pressure (while the heart is beating), and the bottom number measures the diastolic blood pressure (while the heart is at rest).  Normal numbers for blood pressure range from 90/60 to 120/80.

17. Cardiovascular Disease  Leading cause of death  Atherosclerosis: fatty deposits on artery walls  Hypertension: High blood pressure

18. Credits  Graphics courtesy of Crystalcafe.com & The Franklin Institute online.