Neural tissue develops in the embryo from a portion of the
A. ectoderm.
B. endoderm.
C. mesoderm.
A
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Match the secretion with the correct cell type.A. Endocrine cellsB. HepatocyteC. Parietal cellsD. Acinar cellsE. Goblet cellsMucus
Fill in the blank(s) with the appropriate word(s).
Which vitamin begins its synthesis in the skin exposed to ultraviolet light?
A. vitamin C B. vitamin E C. vitamin B D. vitamin D E. vitamin A
Matching
A) Homozygous B) Sex chromosomes C) Recessive D) Genotype 1) Actual genetic makeup. 2) A chromosome pair that may be very different in size. 3) Genes not expressed unless they are present in homozygous condition. 4) Situation in which an individual has identical alleles for a particular trait.
The main function of serous fluid is to
A. facilitate the diffusion of oxygen across the respiratory membrane. B. improve adhesion of the lungs to the thoracic wall. C. lubricate and reduce friction between pleural membranes around the lung.