61) A muscle fascicle is
A) a bundle of cells.
B) a single muscle cell.
C) a bundle of myofilaments.
D) a tendon.
62) An aponeurosis is
A) a large muscle.
B) a nerve to a muscle.
C) clinical pain in a muscle.
D) a sheet of dense connective tissue.
63) What causes a strain or muscle pull?
A) a tear in a muscle
B) a tear in a tendon
C) pain in a muscle due to any muscle disorder
D) a sudden involuntary spasm of a muscle
64) Of the three classes of muscle cells, the only one in which the nuclei lie peripherally instead of centrally is
A) skeletal.
B) cardiac.
C) smooth.
D) visceral.
65) In striated muscle cells, which of these structures stores calcium ions that trigger contraction?
A) the internal surface of the plasma membrane
B) the terminal cisterns
C) T tubules
D) the myofibrils
66) In striated muscle, the I band is where
A) only thick filaments occur.
B) thin filaments occur.
C) H zones occur.
D) thick and thin filaments occur.
67) Of the various types of skeletal muscle fibers, the fibers that experience fatigue sooner are
A) slow oxidative fibers.
B) fast glycolytic fibers.
C) fast oxidative fibers.
D) slow glycolytic fibers.
68) Of the various types of skeletal muscle fibers, the fibers
most
resistant to fatigue are
A) slow oxidative fibers.
B) fast glycolytic fibers.
C) fast oxidative fibers.
D) slow glycolytic fibers.
69) Of the various types of skeletal muscle fibers, the ones with the thinnest myofibrils are
A) slow oxidative fibers.
B) fast glycolytic fibers.
C) fast oxidative fibers.
D) slow glycolytic fibers.
70) Of the various types of skeletal muscle fibers, the ones supplied by the most capillaries are
A) slow oxidative fibers.
B) fast glycolytic fibers.
C) fast oxidative fibers.
D) slow glycolytic fibers.
71) One of the largest and strongest muscles in the body is the gluteus maximus in the buttocks, which is important in these diverse muscular activities; walking, running, and climbing stairs. It must consist of
A) slow oxidative fibers only.
B) fast glycolytic fibers only.
C) fast oxidative fibers only.
D) a mixture of fiber types.
72) In skeletal muscle fibers, which band or zone contains both thick and thin myofilaments?
A) Z
B) H
C) I
D) A
73) In muscular dystrophy,
A) muscles decrease in size because of loss of fat and connective tissue.
B) muscle fibers degenerate and atrophy.
C) most forms of the disease do not appear to be inherited.
D) most cases appear in young females.
74) Muscle tissue is endowed with all of the following properties
except
A) excitability.
B) contractibility.
C) extensibility.
D) transmissibility.
75) After a muscle fiber has contracted, the calcium
A) is destroyed.
B) is chemically bound to the myofilaments.
C) is secreted by the Golgi apparatus.
D) is actively transported into the sarcoplasmic reticulum.