At the placenta,
A. nitrogenous wastes enter maternal circulation.
B. nutrients enter the fetal circulation.
C. oxygen enters the fetal circulation.
D. All apply.
Answer: D
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About how many cells constitute the body of an adult?
A. 50 to 100 quadrillion B. 50 to 100 billion C. 50 to 100 million D. 50 to 100 trillion
The embryonic feature that gives rise to the anterior and lateral horns of gray matter is the _____ plate
A. basal B. alar C. ulnar D. anterior E. posterior
Select the statement that is true concerning primary teeth.
A) There are 27 primary teeth, and the molars are permanent. B) There are 24 primary teeth, and no new primary teeth appear after 13 months. C) There are 20 primary teeth, and by 24 months of age most children have all 20. D) There are 32 primary teeth, and most children lose these teeth due to decay because they are never very strong.
The thoracic cage forms a semirigid chamber that can increase and decrease in volume during respiration.
Indicate whether the statement is true or false.