Q. No.Lymph does not contain:
1.
proteins
2.
microorganisms
3.
red blood cells and platelets
4.
minerals
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The sinoatrial node is the normal pacemaker of the human heart because it:
1. can form action potentials that can spread throughout the rest of the heart
2. depolarizes to its threshold potential before other pacemakers in the heart
3. is located in the top of right atrial wall
4. is most likely to form an ectopic focus
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The average life span of human red blood cells is:
| 1. | 10 days | 2. | 120 days |
| 3. | 21 days | 4. | three months |
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A chest pain or pressure, usually due to not enough blood flow to the heart muscle, is known as:
| 1. hypoxia | 2. infarction |
| 3. angina | 4. diaphoresis |
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What is the percentage of atrial blood that flows into the ventricles without atrial systole?
| 1. | 90 | 2. | 70 |
| 3. | 50 | 4. | 30 |
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The colloid osmotic pressure in the human blood is largely due to:
| 1. | electrolytes | 2. | albumin |
| 3. | fibrinogen | 4. | globulins |
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QRS complexes on the ECG tracings show that:
1. The atria are depolarizing.
2. The ventricles are depolarizing.
3. The ventricles are repolarizing.
4. The heart is at rest.
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The aortic semilunar valve prevents blood from returning to the _____.
| 1. | left ventricle | 2. | aorta |
| 3. | right ventricle | 4. | left atrium |
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Pulmonary veins return the oxygenated blood from the lungs to:
| 1. | right atrium | 2. | left atrium |
| 3. | right ventricle | 4. | left ventricle |
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