A normal hematocrit value of 45 means that ________________.
1. 45% if the formed elements are erythrocytes
2. there are 45 million formed elements per ml of whole blood
3. 45% of the total blood volume is formed elements
4. 45 ml of plasma are tested by centrifugation

Subtopic:  Blood: General Description & RBC |

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The type of antigen on the surface of RBC and the type of antibodies in plasma of person with genotype IAIO would respectively be:

1. B; anti B 2. A; anti B
3. A; anti A 4. B; anti A
Subtopic:  Blood: Blood Group (A,B,O) |
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Identify the incorrect statement regarding the hemolytic disease of the newborn:
1. The fetus is Rh positive, and the mother is Rh negative.
2. The mother's immune system has made antibodies against the Rh factor present on the red blood cells of the previous baby.
3. The baby is born with an abnormally high number of red blood cells.
4. This can be prevented if the Rh negative mother has been given RhoGAM (antibodies).

Subtopic:  Blood: Blood Group |
 69%
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When a blood vessel gets injured, the first event to occur in hemostasis is:
1. The endothelial lining is damaged, exposing collagen proteins to the blood.
2. The injured blood vessel is dilated by newly released chemicals to let in defense cells.
3. Platelets become "sticky" and a platelet plug is formed near the injury site.
4. A web of fibrin protein strands tightly interweave the platelet plug.

Subtopic:  Blood: Blood Clotting |

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Which of the following ions is vital for coagulation of blood?

1. Na+ 2. Ca++
3. K+ 4. H+
Subtopic:  Blood: Blood Clotting |
 82%
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What is the average duration of diastole and systole in a cardiac cycle lasting 0.8 seconds?
1. 0.3 seconds; 0.5 seconds
2. 0.4 seconds; 0.4 seconds
3. 0.5 seconds; 0.3 seconds
4. 0.6 seconds; 0.2 seconds

Subtopic:  Human Heart: Cardiac Cycle |

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How would the right heart compared to the left during one cardiac cycle?
1. left heart pumps a lesser volume of blood than the right heart
2. right heart contracts shortly before the left heart
3. right heart pumps blood with less force (at lower pressure) than the left heart
4. left heart has a shorter cardiac cycle duration than the right heart

Subtopic:  Human Heart: Cardiac Cycle |
 69%

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A person has atrial septal defect [hole in the interatrial septum]. This would result in the abnormal flow of blood from:
1. the right side of the heart to the left
2. the left side of the heart to the right
3. the pulmonary artery to the aorta
4. the ductus arteriosus to the aorta

Subtopic:  Human Heart: Gross Anatomy | Human Heart: Cardiac Cycle |

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The plateau in the cardiac action potential is primarily due to:
1. slow outward diffusion of K+
2. fast inward diffusion of Cl-
3. fast outward diffusion of Ca2+
4. slow inward diffusion of Ca2+

Subtopic:  Human Heart: Cardiac Cycle |

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Artificial pacemakers can be used to treat a patient suffering from:
1. a myocardial infarction
2. atherosclerosis
3. a third degree AV node block
4. mitral stenosis

Subtopic:  ECG & Coronary Artery Disease |

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