Which of the following is one of the principal extracellular cations?
a. Bicarbonate
b. Chloride
c. Phosphate
d. Sodium
Ans: d. Sodium
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The figure illustrates the sacrum. What structure does "C" represent?
A. Coccyx B. Posterior sacral foramina C. Median sacral crest D. Superior articular facet E. Sacral hiatus
A connective tissue fiber refers to a(n) ________, a nerve fiber refers to a(n) ________, and a muscle fiber refers to a(n) ________
A) organelle; entire cell; complex of macromolecules B) entire cell; organelle; tissue C) organelle; entire cell; part of a cell D) complex of macromolecules; part of a cell; entire cell E) complex of macromolecules; entire cell; part of a cell
The hollow cavity within the blastocyst is the
A) blastula. B) gastrula. C) blastocoele. D) trophoblast. E) ootid.