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6. Which of the following has a closed, single circulatory system?
7. What would an ECG trace be used to find?
- Whether part of the heart muscle is unhealthy
- The blood pressure within the heart
- The size of the heart muscle
8. How is tissue fluid formed?
- The pressure of the blood becomes too high and small molecules are forced out
- The pressure of the blood becomes too high and small molecules are forced out through gaps in the capillary wall
- The pressure of the blood becomes too low and small molecules leak out through gaps in capillary walls
- The pressure of the blood becomes too high and large molecules are forced out through gaps in the artery walls
9. Which part of the heart is called the pacemaker?
- Sinoatrial node
- Atrioventricular node
- Vena cava
- Purkyne tissue