Arm and legs buds appear at about 28 days from
A. somitomeres.
B. neural crest cells.
C. apical ectodermal ridges.
D. the coelom.
Answer: C
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What structure traverses the opening indicated by the arrow in the following figure?
A) esophagus B) inferior vena cava C) aorta D) psoas major E) quadratus lumborum
An electrolyte is
A. a positively charged ion. B. a combination of atoms held together by chemical bonds. C. a negatively charged ion. D. a substance that conducts electricity when placed in solution. E. the alteration in the three-dimensional structure of a protein.
A clot that forms and remains in an unbroken blood vessel is a(n)
A. thrombus. B. plasmin. C. embolus. D. stem cell.
What feature of your ear accounts for its ability to regain its shape after it has been deformed or compressed?
A. The elastic fibers present in the ear's muscles B. The ear has a built-in memory based upon its overall size and shape C. The ear's skin is filled with elastic fibers that contract after being stretched D. There is an abundance of reticular fibers forming a dense meshwork E. The elastic fibers present in the ear's cartilage