During the third week of development, what is the result of gastrulation?
A. It converts the epiblast into a hypoblast.
B. It forms the amniotic cavity.
C. It forms the neural tube.
D. It forms the primitive streak.
E. It converts the hypoblast into endoderm.
Answer: E
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The facial bone that becomes disassociated in a tripod fracture is the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is correct?
A) In deuterostome animals, the blastopore becomes the mouth and the anus forms at a distant site. B) In coelomate animals, the coelom is located between the endoderm and the mesoderm. C) Arthropods show metamerism and tagmatization. D) Deuterostomes include the arthropods, echinoderms, and chordates.
Structure B is the
A) epiphysis.
B) diaphysis.
C) endosteum.
D) periosteum.
E) metaphysis.
Just prior to atrial contraction,
A. all four chambers are at rest and AV valves are open. B. all four chambers are at rest and AV valves are closed. C. all four chambers are contracting and all valves are open. D. both ventricles are contracting and blood is being ejected into the major arteries. E. both atria are contracting and blood is being ejected into the major arteries.