1. CIRCULATORY ROUTES

3. 1. Systemic circulation Arteries carry oxygenated blood to all body tissue (except alveoli of lungs); veins deoxygenated blood (with CO2) back to heartArteries carry oxygenated blood to all body tissue (except alveoli of lungs); veins deoxygenated blood (with CO2) back to heart Major vessels: aorta, superior/inferior vena cavaMajor vessels: aorta, superior/inferior vena cava

4. 2. Pulmonary circulation –Shorter –Arteries: thinner walls, less elastic tissue, larger diameter (resistance?) –Deoxygenated blood (CO2 rich) to lungs and oxygen-rich back to heart –Pulmonary trunk, pulmonary arteries/veins

6. 3. Hepatic portal circulation –Carries venous blood (nutrient-rich) from gastrointestinal tract to liver Liver: glucose  glycogen (storage), detoxifies, destroys bacteria

7. 4. Coronary route: Supplies oxygen/nutrients to heart cellsSupplies oxygen/nutrients to heart cells Coronary arteries branch from ascending aorta and encircle heart, into capillaries, then into coronary veins (drain deoxygenated blood into right atrium)Coronary arteries branch from ascending aorta and encircle heart, into capillaries, then into coronary veins (drain deoxygenated blood into right atrium)

8. 5. Fetal circulation –Placenta –Umbilical cord: 2 arteries (fetal waste), 1 vein (fetal nutrients) –Ductus venosus: by-passes (skips) most liver –Foramen ovale: between atria; by-pass lungs –Ductus arteriosus: connects trunk to aorta: by- pass lungs WARNING: placenta on next slide

9. PLACENTA WITH UMBILICAL CORD