1. Circulatory and respiratory

2. Blood FUNCTION transports nutrients, O2, CO2, & waste
defends the body against disease

3. Components of blood PLASMA: liquid medium
made of 90% water, sugar, salts, amino acids, vitamins, minerals

4. Components of blood
2. RED BLOOD CELLS (erythrocytes): transport CO2 and O2 gas
made of iron-containing hemoglobin (O2 binds here)
lack of nucleus leaves space to transport materials

5. Components of blood
WHITE BLOOD CELLS (leukocytes): defend against pathogens

6. Components of blood
4. PLATELETS: form blood clots

7. CIRCULATORY SYSTEM Function
Moves nutrients and waste throughout the body

8. STRUCTURES
1. Heart: muscular organ that pumps blood to all parts of the body.
Divided into right side and left side by septum
Each side has an upper section (atrium) and lower section (ventricle).

9. Structures, cont.
2. Vessels: smooth muscle surrounded by connective tissue

10. Structures, cont.
2. Vessels: smooth muscle surrounded by connective tissue
arteries – carries blood AWAY from the heart
veins –carries blood to the heart

11. Structures, cont.
2. Vessels: smooth muscle surrounded by connective tissue
arteries – carries blood AWAY from the heart
veins –carries blood to the heart
capillaries –narrow blood vessels that pass blood in single file. Gas exchange occurs here.

12. Two Circuits (Pathways)
MOVEMENT OF BLOOD
Two Circuits (Pathways)
1. Pulmonary (deoxygenated)
right side of heart sends blood to the lungs for gas exchange

13. Two Circuits (Pathways)
MOVEMENT OF BLOOD
Two Circuits (Pathways)
1. Pulmonary (deoxygenated)
right side of heart sends blood to the lungs for gas exchange
2. Systemic Circuit (oxygenated)
left side of heart sends blood to the body to deliver oxygen and pick up waste

14. RESPIRATORY SYSTEM External Function Pathway
Exchange of gases between atmosphere and blood
Pathway
mouth/nose  pharynx epiglottis trachea bronchi lungs

15. MECHANISM
Large skeletal muscle (diaphragm) contracts pulling thoracic cavity down causing the lungs to fill with air

16. INTERNAL FUNCTION Exchange of gases between blood and other body cells
Gases diffuse across due to concentration gradients (high to low)