All of the following may be associated with a "heart block" except:
A) section of the superior part of the thoracic sympathetic trunk.
B) coronary artery disease.
C) loss of synchrony between atrial and ventricular contractions.
D) use of an artificial pacemaker.
E) ventricular fibrillation.
Ans: A
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Identify the structure labeled "3."
Which statement about gas transport is true?
A. Most of the carbon dioxide is transported in the blood by hemoglobin as oxyhemoglobin, and most of the oxygen is transported in the blood as bicarbonate ions. B. Most of the oxygen is transported in the blood by hemoglobin as oxyhemoglobin, and most of the carbon dioxide is transported in the blood as bicarbonate ions. C. Most of the oxygen is transported in the blood by hemoglobin as bicarbonate ions, and most of the carbon dioxide is transported in the blood as oxyhemoglobin. D. None of these are correct.
Which two glands are especially noted for regressing after childhood?
A. The thymus and pineal gland B. The anterior and posterior pituitary C. The thymus and thyroid D. The thymus and adrenal medulla E. The thyroid and parathyroids
The hypothetico-deductive method is common in physiology, whereas the inductive method is common in anatomy
Indicate whether the statement is true or false