Pleural fluid surrounds the pericardial cavity.
Answer the following statement true (T) or false (F)
False
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At rest, active sites on the actin are blocked by
A) myosin molecules. B) troponin molecules. C) tropomyosin molecules. D) calcium ions. E) ATP molecules.
Answer the following statements true (T) or false (F)
1. If a patient were having a heart attack caused by a blood clot, streptokinase would be an effective treatment in dissolving the clot. 2. A person with B antigens on the red blood cell and anti-A antibodies in the plasma would have type A blood. 3. A person with both A and B antigens on the red blood cell and no antibodies in the plasma would have type AB blood. 4. A person with both A and B antigens on the red blood cell and no antibodies in the plasma would have type O blood. 5. A person with no antigens on the red blood cell and both anti-A and anti-B antibodies in the plasma would be considered a universal recipient.
Why is ventricular fibrillation fatal?
A) Ventricular fibrillation is fatal because the ventricles quiver and do not relax long enough to be filled with blood by the atria. B) Ventricular fibrillation is fatal because the ventricles quiver and do not pump blood to the systemic circulation. C) Ventricular fibrillation is fatal because the ventricles do not relax long enough for the coronary vessels to fill with blood for the coronary tissue to receive oxygen and nutrients. D) Ventricular fibrillation is fatal because the heart is beating to an ectopic pacemaker and the rhythm is irregular. E) Ventricular fibrillation is fatal because the heart rate slows significantly and blood flow and pressure decreases.
What technique creates a three-dimensional dynamic image of blood vessels?
A. digital subtraction angiography B. magnetic resonance imaging C. dynamic spatial reconstruction D. positron emission tomography