The process of spermatogenesis from primary spermatocyte to sperm
A. takes about three weeks in the human.
B. requires participation of Sertoli cells.
C. occurs when a male is an embryo, ceasing at birth.
D. occurs as the cells gradually travel between two closely attached Leydig cells.
E. occurs in the epididymis.
Answer: B
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The parasympathetic division arises from the __________ regions of the spinal cord.
A. brain, thoracic, and lumbar B. brain, sacral, and coccygeal C. brain, lumbar, sacral, and coccygeal D. sacral and lumbar E. brain and sacral
Red blood cells (RBCs) have been placed in three different solutions: hypotonic, hypertonic, isotonic. What is solution "B" relative to the RBC?
A. Isotonic solution B. Hypotonic solution C. Hypertonic solution
Cyanocobalamin is found exclusively in plants.
Answer the following statement true (T) or false (F)
In humans, only ________ cells have flagella.
A) sperm B) intestine lining C) uterine tube lining D) stomach lining E) respiratory tract lining