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When erythrocytes are destroyed, which of the following events occurs? - (Correct Answer)The
globin portion of the molecule is broken down into amino acids.
Type AB blood - (Correct Answer)has both A and B antigens on the red cells
In the platelet release reaction, - (Correct Answer)ADP and thromboxanes stimulate other
platelets to become activated.
The hematocrit is - (Correct Answer)d. the percentage of RBCs in a given volume of blood.
What vitamin is necessary to produce many clotting factors in the liver? - (Correct
Answer)Vitamin K
A white blood cell engulfing a bacterium is an example of blood functioning in - (Correct
Answer)a. protection.
The oxygenated form of hemoglobin is called - (Correct Answer)oxyhemoglobin
The only formed elements that possess a nucleus when mature are the - (Correct Answer)c.
leukocytes
Plasma - (Correct Answer). is the liquid matrix of the blood.
An increased amount of heparin in the blood might - (Correct Answer). prevent clotting process.
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,On which chromosome is there a mutation that leads to sickle cell anemia? - (Correct Answer)b.
chromosome 11
Blood consists of a matrix of plasma and cells; blood is a subtype of ______ tissue. - (Correct
Answer)e. connective
The ability of white blood cells to leave the circulation and enter tissues is called - (Correct
Answer)b. diapedesis.
The nervous system and certain chemicals can cause the constriction of a blood vessel. This is
known as - (Correct Answer)b. vascular spasm
The cascade of events in the intrinsic pathway can be set into motion when _____ comes into
contact with collagen. - (Correct Answer)factor XII
If a blood buffer is absent, what function of the blood would be compromised? - (Correct
Answer)regulation of pH
What is tissue thromboplastin? - (Correct Answer)A compound released by damaged tissue that
initiates the extrinsic clotting pathway
A deficiency of which of the following stem cells would result in a marked increase in the
clotting time of blood? - (Correct Answer)megakaryoblast
Macrophages are derived from - (Correct Answer)monocytes
Which of the following events is one of the three main stages of coagulation? - (Correct
Answer)conversion of fibrinogen to fibrin
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,The "pacemaker" of the heart is the - (Correct Answer)SA node
Where is blood moving during the period of ejection? - (Correct Answer)Ventricles to great
vessels
The adult heart averages ___________ grams. - (Correct Answer)250-300
The epicardium - (Correct Answer)covers the surface of the heart.
Energy for contraction of myocardial cells comes primarily from - (Correct Answer)aerobic
respiration in the mitochondria
What event(s) occur during the QRS complex of an ECG? - (Correct Answer)depolarization of
the ventricles and repolarization of the atria
The relationship between preload and stroke volume is known as - (Correct Answer)Starling Law
of the heart.
Cardiac muscle cells - (Correct Answer)are maintained by an extensive capillary network.
During the isovolumetric contraction period of the cardiac cycle, - (Correct Answer)AV and
semilunar valves are closed.
Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can
eject blood. - (Correct Answer)pulmonary trunk
In the cardiac cycle, - (Correct Answer)all four chambers of the heart are in diastole at the same
time.
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, What cardiac arrhythmia will have no QRS complex as a symptom? - (Correct
Answer)ventricular fibrillation
Which of the following is administered to the people suffering from myocardial infarction
following onset of symptoms? - (Correct Answer)Tissue plasminogen activator (t-PA)
Which of the following might increase the risk for cardiovascular disease? - (Correct
Answer)chronic stress
Aortic stenosis results from - (Correct Answer)a narrowed opening through the aortic valve
An incompetent pulmonary semilunar valve could result in less blood reaching the - (Correct
Answer)lungs
A patient has been diagnosed with mild heart disease. Tests show that some of the coronary
arteries are partially occluded. Which of the following is the best course of action to treat the
disease? - (Correct Answer)Angioplasty
Angina pectoris is chest pain caused by reduced - (Correct Answer)blood supply to cardiac
muscle.
Coronary artery disease can diminish myocardial blood flow resulting in the death of myocardial
cells. This condition is known as a myocardial - (Correct Answer)infarction
What abnormal heart rhythm could be caused by an elevated body temperature, excessive
sympathetic stimulation, or toxic conditions? - (Correct Answer)tachycardia
Which type of vessel has the greatest compliance? - (Correct Answer)veins
还是指某个特定的词或概念
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