Term
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Definition
Nutrients
Gas Exchange
Removal of wastes |
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Term
| Diffusion alone is inadequate/adequate for large and complex bodies? |
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Definition
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Term
| Most animals use a circulatory system with: |
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Definition
-Blood
-Heart
-Blood vessels |
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Term
| Blood flows though what circulatory system of humans? |
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Definition
| DOUBLE circulatory system |
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Term
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Definition
-2 thin-walled atria
-Thick- walled ventricles |
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Term
| What does the thin-walled atria in the mammalian heart do? |
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Definition
| -pump blood to ventricles |
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Term
| What do the thick-walled ventricles in the mammalian heart do? |
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Definition
| -pump blood to lungs and all other body regions |
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Term
| What does a pacemaker do? |
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Definition
| sets the tempo of the heartbeat |
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Term
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Definition
-Set the rate of heart contractions
-Generates electrical signals in atria |
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Term
| What does an electrocardiogram do? (ECG) |
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Definition
| records electrical changes in heart |
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Term
| Does heart rate adjust to body needs? |
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Definition
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Term
| What can you do when abnormal rhythms occur in a heart attack? |
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Definition
-an external defibrillator can restore rhythm
-Implanted artificial pacemakers can trigger normal rhythms |
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Term
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Definition
-lined by single layer of epithelial cells
-Smooth muscle in walls can reduce blood flow
-Elastic fibers permit recoil after stretching
-Veins have one-way valves that restrict backward flow |
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Term
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Definition
-Thin walls- a single layer of epithelial cells
-Narrow- blood cells flow in a single file
-Increase surface area for gas and fluid exchange |
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