CIRCULATORY ROUTES.

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Presentation transcript:

CIRCULATORY ROUTES

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)

WARNING: placenta on next slide 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

PLACENTA WITH UMBILICAL CORD

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