Undifferentiated ____________________ reside in the bone marrow, where they continuously divide and differentiate to give rise to each of the types of blood cells
Fill in the blank(s) with correct word
pluripotential stem cells
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Which extraembryonic structure is created as migrating mesodermal cells form a layer beneath the trophoblast, separating it from the blastocoele?
A) amnion B) placenta C) allantois D) yolk sac E) chorion
Answer the following statement(s) true (T) or false (F)
1. Articulation difficulties result from an impairment of central linguistic abilities. 2. Three subdivisions of language include pragmatics, articulation, and syntax. 3. Phonetic variations and allophonic variations represent phonemes. 4. Speech sounds and phonemes represent exactly the same concepts. 5. Impaired comprehension of the sound system of a language and the rules that govern the sound combinations represent a phonological disorder.
Water-soluble substances move through the blood-brain barrier by
A) active transport. B) mediated transport. C) diffusion. D) None of the above.
What extracellular ion is necessary for release of neurotransmitter for salty and sour tastes?
A. Na+ B. Ca2+ C. K+ D. Mg2+