Term
| What is the function of arteries. |
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Definition
| carry blood away from the heat at high pressure. |
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Term
| What is in the walls of arteries that make its wall strong and elasic |
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Definition
| muscle cells and elastic fibres |
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Term
| where does the hepatic artery bring blood |
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Definition
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Term
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Definition
| the main artery that supplies oxygenated blood to the tissues of the body |
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Term
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Definition
| when the circular muscles in the wall of the artery form a contractile ring which decrease the size of the lumen to remain blood pressure. |
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Term
| What does the permeability of the capillary wall allow? |
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Definition
| exchange of materials between cells in the tissue fluid and the blood in the capillary. |
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Term
| Bruises are damage to capillary walls and leakage of fluid. how is a bruise healed? |
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Definition
| The capillaries are quickly repaired and hemoglobin is broken down to green and yellow bile pigments, which are then transported away. Phagocytes remove the remains of blood cells. |
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Term
| What is the function of veins |
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Definition
| collect blood at low pressure from the tissues of the body and return it to the atria of the heart |
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Term
| How many, and which, blood circulation does the body have? |
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Definition
| 2 (pulmonary = to and from lungs, systemic = to and from body) |
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Term
| Why is the heart a double pump? |
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Definition
| because oxygenated and deoxygenated blood may not mix and travels to other places. |
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Term
| Where are semilunar valves in the heart |
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Definition
| between the ventricle and the artery. |
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Term
| Does the left side of the heart pump oxygenated or deoxygenated blood? |
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Definition
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Term
| what is atherosclerosis and how is it caused. |
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Definition
| the development of fatty tissue in the artery wall. Accumulation of fats causes the narrowing of the lumen, which then impedes blood flow. |
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Term
| What is the SA Node's function |
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Definition
| a small group of special muscle cells in the wall of the right atrium that initiates each heartbeat in each cardiac cycle. |
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Term
| Why is there a time delay of 0.1 sec in between the contraction of the atria and the ventricles? |
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Definition
| Because the ventricles receive the signal later through fibres, and first the blood is pumped into the ventricles by the atria, and then the ventricles pump the blood away from the heart. |
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Term
| What does epinephrine do? |
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Definition
| epinephrine (adrenalin) is a hormone that increases the heart rate to prepare for vigorous physical activity |
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Term
| What did william harvey find out about blood vessels? |
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Definition
| that blood flow through the larger vessels is unidirectional, with valves to prevent backflow. He also showed that the rate of flow through major vessels was far too high for the blood to ‘be consumed’ by tissues as previously believed, and that it therefore must return to the heart to be recycled. disproved Galen's idea that blood is converted into animal spirits in brain. |
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