Biology, Eighth Edition (Raven)

Chapter 47: The Musculoskeletal System

Post Test

What is the sequence of events in earthworm movement? (p .944)
1 = chaetae lose contact with ground
2 = chaetae dig into ground
3 = anterior circular muscles contract extending the body forward
4 = longitudinal muscles contract
5 = wave of circular muscle activity passes back in waves
A)1, 2, 3, 4, 5
B)3, 1, 5, 4, 2
C)3, 5, 1, 4, 2
D)4, 2, 3, 1, 5
Osteoblasts: (p. 946)
A)secrete alkaline phosphatise.
B)can turn into osteocytes.
C)can turn into osteoclasts.
D)are not associated with collagen fibers.
E)both a and b
Isotonic contraction of muscles is when: (p. 952)
A)the muscle attempts to shorten but cannot do so.
B)the force of contraction remains relatively constant throughout the contraction process.
C)the muscle goes into spasms.
D)the force of contraction varies throughout the contraction process.
E)none of the above
What is required for striated muscles to contract? (p. 955)
A)release of calcium ions from troponin
B)binding of calcium ions to tropomyosin
C)binding of calcium ions to troponin
D)release of calcium ions from tropomyosin
E)none of the above
True of False: Some insects beat their wings at frequencies faster than the nerves can carry successive impulses. (p. 960)
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