Hemoglobin F ________.
A. has a lower affinity for oxygen than hemoglobin A
B. binds large amounts of 2,3-DPG
C. contains two alpha and two gamma chains
D. is increased in sickle-cell anemia
Answer: C
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The separation between the inner cell mass and the trophoblast forms a fluid-filled chamber called the
A) chorion. B) yolk sac. C) allantois. D) amniotic cavity. E) placenta.
Which of the following is located at the midline in a cross-sectional view at the level of the optic chiasm?
A) parietal bone B) zygomatic bone C) nose D) hippocampus E) eyes
How would blocking the activity of acetylcholinesterase affect skeletal muscle?
A) It would make the muscles less excitable. B) It would produce muscle weakness. C) It would cause spastic paralysis (muscles are contracted and unable to relax). D) It would cause flaccid paralysis (muscles are relaxed and unable to contract). E) It would have no effect on skeletal muscles.
Which of the following illustrates acute hormone secretion most accurately?
A. Blood levels of hormone B are maintained at constant levels at all times with very small deviations throughout a 24-hour period. B. Blood levels of hormone A are maintained constantly but increase regularly around meal times. C. Blood levels of hormone C are relatively constant but will increase dramatically under some stressful situations but not as much under other stressful situations.