This figure shows a cross section of the spinal cord. What structure does number 2 indicate?
A. Gray commissure
B. Posterior horn
C. Posterior funiculus
D. Anterior horn
E. Lateral horn
Answer: A
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Layers of bone matrix between osteons are:
a. concentric lamella b. interstitial lamella c. circumferential lamella d. trabecula
Which condition is a disorder of the brain characterized by destruction of brain cells caused by a defective gene?
A. Huntington's disease B. Parkinson's disease C. Alzheimer's disease D. Cerebrovascular accident
All parasympathetic neurons are
A) adrenergic. B) cholinergic. C) nitroxidergic. D) gamma-aminobutyric. E) dopaminergic.
The term fetus is used:
a. after the first 8 weeks of pregnancy b. after the blastocyst has implanted in the uterine wall c. during the entire pregnancy d. from fertilization to the end of the eighth week of pregnancy