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CIRCULATORY ROUTES 1. Systemic circulation • Arteries 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 cava 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 3. Hepatic portal circulation – Carries venous blood (nutrient-rich) from gastrointestinal tract to liver Liver: glucose glycogen (storage), detoxifies, destroys bacteria 4. Coronary route: • • Supplies 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) 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: bypass lungs WARNING: placenta on next slide PLACENTA WITH UMBILICAL CORD