A boy who has not passed through puberty sustains an injury to his anterior pituitary such that FSH is no longer released, but LH is normal. After he grows to maturity, one would expect that he would ________.
A) be sterile
B) not develop secondary sex characteristics
C) be impotent (unable to have an erection)
D) have impaired function of interstitial cells
A) be sterile
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Which of the following is most responsible for keeping the lung surface and the thoracic wall from separating?
A. The negative pressure in the alveolar space B. Subatmospheric intrapleural pressure C. The presence of surfactant D. Alveolar pressure is higher than atmospheric pressure E. The force exerted by the external intercostal muscles
Diurnal rhythms are
a. are inherent cyclical peaks and ebbs of hormone secretion that are a function of time and are entrained to the 24-hour light-dark cycle b. are important in maintaining hormone levels at a relatively constant set point no matter the time of day c. mainly associated with adrenal hormones d. are all of the above e. none of the above
An atom of oxygen has an atomic number of 8 and a mass number of 18. How many of each type of subatomic particle does it contain?
What will be an ideal response?
A pacemaker that appears unexpectedly at an abnormal site in the heart muscle is called a(n) ________
A) Heart muscle cannot serve as a pacemaker. B) supplemental rhythmic center C) ectopic pacemaker D) extrasystole