A 38-year-old male is upset about his low sperm count and visits a "practitioner" who commonly advertises his miracle cures of sterility. The practitioner is a quack who treats conditions of low sperm count with megadoses of testosterone
Although his patients experience a huge surge in libido, their sperm count is even lower after hormone treatment. Explain why.
What will be an ideal response
Megadoses of testosterone would inhibit hypothalamic release of GnRH and may act directly on the anterior pituitary to inhibit gonadotropin (FSH) release. Spermatogenesis is inhibited in the absence of FSH stimulation.
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Pam's daughter is born cross-eyed. As she grows, the problem does not become any better. Her physician suggests cutting an eye muscle to bring the eyes into a more normal position. Which muscle will he cut?
A) inferior rectus B) lateral rectus C) medial rectus D) superior rectus E) superior oblique
The main parts of the juxtaglomerular apparatus are the
A. principal cells and macula densa. B. granular cells and macula densa. C. granular cells and intercalated cells. D. intercalated cells and principal cells. E. principal cells and granular cells.
List the ways that antigen-antibody complexes can destroy target antigens
What will be an ideal response?
If the field diameter of the high-powered objective is 0.5 mm, what is the field diameter of this objective in µm?
A) 500 ?m B) 0.005 ?m C) 50 ?m D) 0.05 ?m