The embryonic disk is initially composed of
A. ectoderm and hypoblast.
B. epiblast and mesoderm.
C. epiblast and hypoblast.
D. hypoblast and yolk sac.
E. epiblast and yolk sac.
C
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A chemical formula expresses ________.
A. the number of atoms for each element in the molecule B. the chemical composition of a molecule C. the atoms involved in chemical bonding D. All of the choices are correct.
A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.
Answer the following statement true (T) or false (F)
Which zone includes the respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli and is where gas exchange occurs?
A) respiratory zone B) conducting zone C) terminal zone D) filtering zone
When ADH levels are high in the body, there is what effect on the kidneys?
A. Increased sodium secretion B. Increased sodium reabsorption C. Increased water reabsorption D. Decreased water reabsorption