Which feature enables epithelial tissue to serve as a protective layer in areas subject to abrasion and/or erosion?
A. It rests on a basement membrane.
B. Its cells undergo rapid mitosis.
C. It is avascular.
D. It secretes substances.
E. It is well supplied with nerves.
Answer: B
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A middle-aged male patient complains of a weak "stream" and nocturia. You believe the most likely cause to be:
A) a bladder infection. B) a spinal cord lesion affecting his pelvic splanchnic nerves. C) benign prostatic hypertrophy. D) a ureteric calculi. E) an obstruction of his intramural (preprostatic) urethra.
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
Tight junctions between ________ are responsible for the formation of the blood-testis barrier.
A. Sertoli cells B. spermatogonial cells C. trophoblast cells D. Leydig cells