What is the percentage of atrial blood that flows into the ventricles without atrial systole?

1. 90 2. 70
3. 50 4. 30

Subtopic:  Human Heart: Cardiac Cycle |
 73%
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Atria can completely empty during ventricular filling due to:
1. A-V node
2. A-V bundle
3. S-A node
4. Purkinje fibers

Subtopic:  Human Heart: Cardiac Cycle |

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The period that extends from the onset of atrial depolarization until the onset of ventricular depolarization is shown in an ECG as:
1. QRS complex
2. S-T interval
3. P-Q interval
4. QRS-T interval

Subtopic:  ECG & Coronary Artery Disease |
 62%

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The arrhythmia that results in cardiac arrest followed by death in the absence of treatment and therefore considered most serious is:
1. Tachycardia
2. Sinus bradycardia
3. Atrial flutter
4. Ventricular fibrillation

Subtopic:  Atherosclerosis, Hypertension & Ventricular Fibrillation |

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The venous return to the heart is facilitated by:
1. valves
2. inspiration
3. skeletal muscle
4. all of these

Subtopic:  Human Heart: Cardiac Cycle |
 52%

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A condition where the arteries become narrowed and hardened due to a buildup of plaque around the artery wall is called as:
1. arteriosclerosis
2. phlebitis
3. atherosclerosis
4. plaque

Subtopic:  Atherosclerosis, Hypertension & Ventricular Fibrillation |
 56%

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During the cardiac cycle the tricuspid and bicuspid valves get closed when:
1. when pressure inside the ventricles is at its lowest
2. when pressure inside the atria is greater than that inside the ventricles
3. when ventricular pressure exceeds that of the atria
4. when pressure is greater in the aorta than in the left ventricle

Subtopic:  Human Heart: Cardiac Cycle |
 75%
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A large bone marrow cell with a lobated nucleus responsible for the production of blood thrombocytes is:
1. progranulocyte
2. basophilic band cell
3. monoblast
4. megakaryoblast

Subtopic:  Blood: General Description & RBC |
 83%

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The least significant factor for erythropoiesis amongst the following is:
1. vitamin B12
2. vitamin B6
3. folic acid
4. gastric intrinsic factor

Subtopic:  Blood: General Description & RBC |

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A disease state in which the hematocrit (the volume percentage of red blood cells in the blood) is elevated is called as:
1. polycythemia
2. anemia
3. leukemia
4. porphyria

Subtopic:  Blood: General Description & RBC |
 63%

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