Deck 9: Integumentary, skeletal, and Muscular Systems

Question 1

New nuclei are added to a growing muscle fiber by______________.

A)Mitotic division of existing myonuclei
B)Incorporation of neural crest cells
C)Fusion of two muscle fibers
D)Nonmitotic division of existing myonuclei
E)Incorporation of satellite cells

Answer 1

E

Question 2

Which of the following associations is correct?

A)MyoD - smooth muscle
B)Mitosis - cardiac muscle
C)Satellite cells - smooth muscle
D)MyoD - cardiac muscle
E)Splanchnic mesoderm - skeletal muscle

Answer 2

B

Question 3

How many nuclei would you expect to find in a myoblast?

A)1
B)2
C)4
D)8
E)None of the above

Answer 3

A

Question 4

Which molecular marker characterizes myoblasts migrating into the limb buds from the somites?

A)Hoxd-1
B)Pax-3
C)Sonic hedgehog
D)Hoxa-3
E)Transforming growth factor-β

Question 5

The skeletal musculature of the limb arises from the _________________.

A)Somatopleure of the lateral plate mesoderm
B)Neural crest
C)Splanchnopleure of the lateral plate mesoderm
D)Neural tube
E)Somites

Question 6

Which molecule steers mesenchymal cells toward an osteogenic program?

A)Sox-9
B)Sonic hedgehog
C)Runx-2
D)All of the above
E)None of the above

Question 7

Which characteristic does not apply to the cellular precursors of limb muscles?

A)Located in the lateral half of the somite
B)Migration and differentiation are little influenced by axial structures
C)Express myogenic determination factors within the somite
D)Migrate into the limb bud before differentiating
E)None of the above

Question 8

In the development of the human vertebral column,the proatlas anlage becomes incorporated into which of the following?

A)Bodies of the atlas and axis
B)Basioccipital bone and the body of the atlas
C)Basioccipital bone and the dens of the axis
D)Body of the atlas and the dens of the axis
E)Body of the axis and the dens of the atlas

Question 9

A ________________ is a mononuclear cell committed to forming only skeletal muscle.

A)Myoblast
B)Mesenchymal cell
C)Myotube
D)Schwann cell
E)Melanocyte