A 6-year-old girl comes to her pediatri- cian with constipation, abdominal disten- tion, and vomiting. After thorough examina- tion, she is diagnosed as having Hirschsprung's disease (aganglionic megaco- lon), which is a congenital disease and leads to dilation of the colon. This condition is caused by an absence of which of the following kinds of neural cell bodies?
(A) Sympathetic preganglionic neuron cell bodies
(B) Sympathetic postganglionic neuron cell bodies
(C) Parasympathetic preganglionic neuron cell bodies
(D) Parasympathetic postganglionic neuron cell bodies
(E) Sensory neuron cell bodies
Ans: (D) Parasympathetic postganglionic neuron cell bodies
You might also like to view...
Intracellular fluid (ICF) is found only within
A) blood vessels. B) lymph. C) the cells of the body. D) the interstitial space. E) the cerebrospinal fluid.
Which structure is NOT part of the blood circulation through the kidney?
A) loop of Henle B) glomerulus C) renal corpuscle D) vasa recta
What congenital disorder results when the vertebrae fail to form completely around the spinal cord, typically in the lumbosacral region?
A) cystic fibrosis B) anencephaly C) hydrocephaly D) cerebral palsy E) spina bifida
The semicircular canals
A. contain cupulae that respond to gravity. B. are parallel to each other. C. can detect movement in only one direction. D. have a base called a papilla. E. allow a person to detect movement in all directions.