| Front | Venous system |
|---|---|
| Back | Structure: vessels that carry blood away from the tissues of the body (or placenta) towards the heart. Compared to arteries are: 1. thinner-walled, with less smooth muscle (lower pressure) 2. more numerous 3. more anastomotic 4. wider in diameter - becoming even wide as tributaries join 5. valve-containing Function: Carry de-oxygenated blood except for: 1. pulmonary veins from lungs 2. umbilical veins from placenta Mechanism to return blood to the heart: 1. Massaging veins (changing pressures and muscle contractions) 2. Changing intra-thoracic and intra-abdominal pressure (breathing, etc.) 3. Gravity 4. Negative thoracic pressure |
Tags: veins
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Venous valves limbs structure veins upper lower absent
Previous card: Spinal arteries segmental branches posterior cord adamkowitz structure
Up to card list: Gross Anatomy