Which of the following adrenergic neurotransmitter receptors plays the major role in heart activity?
A) alpha 1
B) beta 1
C) beta 2
D) beta 3
B
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Decerebrate posturing is characterized by:
A) flexion of the arms and extension of the legs. B) inward flexion of the wrists and flexed knees. C) extension of the arms and extension of the legs. D) pulling in of the arms toward the core of the body.
What are the tiny projections in the duodenal lining?
A. Brush border B. Villi C. Lacteals D. None of these are correct.
The buffer system in blood is formed by
A) the chloride shift through the cell membranes. B) deoxyhemoglobin generated in white blood cells. C) hemoglobin binding hydrogen ions in red blood cells. D) phosphate buffer in the renal system.
Which is TRUE about the pleural sac?
A. It is continuous with the atmosphere and protects the lungs from infection. B. It is a closed sac surrounding each lung that contains only a tiny volume of lubricating fluid. C. It is a closed, air-filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure. D. It is a closed sac surrounding each lung and contains a large volume of surfactant. E. It is bounded by pleural membranes that are very thin, which allows for abundant gas exchange.