In a normal electrocardiogram, the
A. P wave occurs after the QRS complex but before the T wave.
B. QRS complex results from ventricular depolarization.
C. P wave results from repolarization of the atria.
D. repolarization of the atria is clearly visible.
E. T wave represents depolarization of the atria.
Answer: B
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Myasthenia gravis is a collection of muscle disorders that cause muscle fatigue and weakness. What is the major mechanism?
A. Autoimmune destruction of L-type Ca2+ channels. B. Overproduction of acetylcholinesterase C. Autoimmune destruction of nicotinic acetylcholine receptors D. Demyelination of axons in motor pathways E. A tumor that overproduces acetylcholine
In a chemical reaction where an electron is exchanged from one reactant to another, the structure that loses an electron is
A. analyzed. B. catalyzed. C. oxidized. D. reduced.
Which of the following is a step within the common pathway of blood clotting?
A. Factor III combines with factor VII. B. Factor XII converts inactive factor XI to active factor XI. C. Prothrombin is activated to thrombin. D. Calcium combines with factor IX.
Long reflexes
A) are required for peristalsis and segmentation. B) involve the myenteric plexus. C) provide a higher level of control over digestive functions. D) do not involve the CNS. E) are controlled by the enteric nervous system.