Circulation
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11 terms
Terms | Definitions |
|---|---|
 Tunics | Tunica intima (innermost layer)-- endothelial cells minimize friction Tunica media (smooth muscle layers and elastin) whose contractions influence blood flow, largest layer in arteries Tunica adventitia (ct that strengthens walls and anchors vessels). Large vessels have blood vessels in this layer called vasa vasorum |
| capillaries | are composed solely of endothelium where diffusion can occur |
| Arteries | take blood away from the heart |
| veins | take blood towards the heart |
| Portal system | two capillary beds lying between an incoming artery and an outgoing vein from a body region i.e. hepatic portal system |
| primitive vertebrate heart | forms as a tube; has four chambers Systole-ventricular contraction Diastole-ventricle rest |
| Coronary arteries | are at the base of the aortic arch in mammals. They are there because the cardiac muscles of mammals require extensive circulation to sustain themselves. |
| fetal mammals | the placenta not the lungs provides oxygenation. Oxygen-rich blood comes in the Umbilical vein goes across the liver through the ductus venosus into the inferior vena cava. It enters the right atrium and immediately crosses to the systemic side bypassing the pulmonary circuit and into the left atrium through a hole called the foramen ovale. Blood is returned through the umbilical arteries. |
| Tunica intima | endothelial cells minimize friction |
| Tunica media | whose contractions influence blood flow, largest layer in arteries |
| Tunica adventitia | (ct that strengthens walls and anchors vessels). Large vessels have blood vessels in this layer called vasa vasorum |
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