15. Which is NOT true regards periosteum: A. is important for bone growth in width B. all bone surfaces in the body are covered by the periosteum C. provides strong attachment and continuity from tendon to bone D. is the structure where blood vessels enter bone through E. consists of an outer, dense connective tissue layer and an inner osteogenic layer F. None of the above
15. Which is NOT true regards periosteum:
A. is important for bone growth in width
B. all bone surfaces in the body are covered by the periosteum
C. provides strong attachment and continuity from tendon to bone
D. is the structure where blood vessels enter bone through
E. consists of an outer, dense connective tissue layer and an inner osteogenic layer
F. None of the above
16. Osteons
I- are the fundamental functional unit of much spongy bone
II- are aligned parallel to the long axis of the bone
III- are cylindrical structures that contain a mineral matrix (lamellae) and living cells connected by canaliculi
IV- they surround a canal containing blood vessels, nerves, and loose connective tissue (Haversian system)
A. I , III
B. II , IV
C. I , II , III
D. II , III , IV
E. All of the above
17. Which of the following choices is CORRECT?
A. Myofibrils extend the length of a muscle fibre
B. sarcomeres in series make up the length of a myofibnil
C. The M-line is part of the cytoskeleton that anchors the myosin filaments, stabilizing the sarcomere
D. The ends of the actin filaments are anchored to the Z-line or disk
E. All of the above
F. Both C and D
18. The binding of calcium to troponin will directly cause
A. the hrydrolysis of ATP
B. the binding of ATP to myosin.
C. the further release of calcium into the cytoplasm
D. the movement of tropomyosin, thereby exposing the myosin-binding site on the actin molecule
E. the movement of troponyosin, thereby exposing the actin-binding site on the myosin molecule.
F. release of neurotransmitters from the axon terminals
G. Bodh B and F
19. Which of the following is a biogenic
A. norepinephrine
B. epinephrine
C. adrenaline
D. dopamine
E. All of the above
F. A and B
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