Preganglionic neurons of the sympathetic nervous system originate in the:
A) collateral ganglion.
B) gray rami communicantes.
C) sympathetic chain ganglion.
D) lateral horns of the spinal cord.
Answer: D
Anatomy & Physiology
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The primary germ layer that takes the place of the hypoblast is the
A. mesoderm. B. endoderm. C. trophoblast. D. chorion. E. centroderm.
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Gastrulation begins when a groove with raised edges called the ________ appears on the dorsal surface of the embryonic disc
A) notochord B) placenta C) primitive streak D) spinal cord
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The atomic number represents the number of:
A) protons in an atom. B) neutrons in an atom. C) protons and neutrons in the nucleus of an atom. D) electrons in an atom.
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A zygote is usually formed within the uterus
Indicate whether the statement is true or false
Anatomy & Physiology