Sympathetic responses generally are widespread because ________
A) preganglionic fibers are short
B) inactivation of ACh is fairly slow
C) NE and epinephrine are secreted into the blood as part of the sympathetic response
D) preganglionic fibers are long
C
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During amniocentesis
A. a needle removes cells from the fetus. B. a piece of the placenta is snipped off and examined for abnormal cells. C. blood is removed from a woman's arm and fetal cells isolated and their chromosomes karyotyped. D. fetal fibroblasts in amniotic fluid are cultured and a karyotype constructed.
A single motor neuron with all the muscle cells it innervates is called a:
a. motor unit b. neuromuscular junction c. neurotransmitter d. both B and C above
We can distinguish between sensations that originate in different areas of the body because
A) different sensory receptor types produce different action potential types. B) incoming sensory information is first assessed by the thalamus. C) sensory neurons from each body region synapse in specific brain regions. D) sensory neurons carry only one type of information. E) None of the answers are correct.
The tissue through which gases are exchanged between the blood and the air in the lungs
is A) simple columnar epithelium. B) simple squamous epithelium. C) stratified squamous epithelium. D) simple cuboidal epithelium.