Which of the following is an autoimmune disorder that leads to the destruction of acetylcholine receptors?
A. Myasthenia gravis
B. Crush syndrome
C. Atrophy
D. Duchenne muscular dystrophy
E. Rhabdomyoma
Answer: A
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Why is the trachea composed of flexibly linked cartilage rings? (
What will be an ideal response?
Physiological dead air space is anatomic dead space plus
A. tidal volume. B. the residual volume. C. the volume of blood flowing to the lungs. D. the respiration rate. E. the volume of any alveoli where gas exchange is diminished.
EPSPs (excitatory postsynaptic potentials) occur when
A) more potassium ions than usual leak out of a cell. B) more calcium ions than usual leak out of a cell. C) chloride ions enter a cell. D) extra sodium ions enter a cell. E) hyperpolarizations occur.
Comparing the left ventricle with the right ventricle, which of the following is true?
A) The left ventricle does more work than the right ventricle. B) The left ventricle pumps against less resistance than the right ventricle. C) The left ventricle produces a lower pressure than the right. D) The right ventricle is thicker than the left ventricle. E) The right ventricle pumps more blood than the left ventricle.