Biology, Eighth Edition (Raven)

Chapter 47: The Musculoskeletal System

Pre Test

1
What is the most significant disadvantage of an exoskeleton in insects? (p .945)
A)Chitin is not a strong as bone.
B)Periodic molting must occur to allow growth.
C)Muscles cannot enlarge in size and power with use.
D)The surface area to volume ratio limits size because gas exchange is by diffusion through tracheae.
2
Mature bone consists of: (p. 946)
A)hydroxyapatite crystals.
B)collagen and hydroxyapatite crystals.
C)calcium phosphate and collagen.
D)calcium phosphate.
3
Synovial joints: (p. 951)
A)are freely movable.
B)join bones together with a synovial capsule.
C)are common in vertebrates.
D)contain lubricating fluid.
E)all of the above
4
True or False: When vertebrate skeletal muscle contracts each myofilament shortens. (p. 953)
A)True
B)False
5
The physical constraints to movement - gravity and frictional drag - are the same in every environment, and are encountered by every animal. (p. 959)
A)True
B)False
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