chap 10- muscle tissue and organization mc Flashcards
Which are considered specific characteristics of all muscle cells?
a: Contractility
b: Extensibility
c: Excitability
d: Elasticity
e: Conductivity
E. a, b, c, d, e
Which are possible functions of skeletal muscles?
a: Maintenance of posture
b: Both highly coordinated and localized simple movements
c: Temperature regulation
d: Support of certain body organs
e: Restricting the movement of material through certain body tracts
A. a, b, e
B. a, b, c
C. a, b, c, e
D. a, b, c, d
E. a, b, c, d, e
E. a, b, c, d, e
- In general, a skeletal muscle is composed of
a: Connective tissue sheaths
b: Nerves
c: Arteries
d: Veins
e: Muscle fibers
A. a, b, c, e
B. a, b, d, e
C. b, c, d, e
D. a, b, c, d
E. a, b, c, d, e
E. a, b, c, d, e
- Which is a correct listing of the hierarchy of a skeletal muscle’s components, beginning with the
smallest?
a: Myofibrils
b: Muscle fiber
c: Fascicle
d: Skeletal muscle
A. a, b, c, d
B. a, c, b, d
C. d, c, b, a
D. c, b, a, d
E. b, c, a, d
A. a, b, c, d
5.
Which is the correct order of the connective tissue layers of a skeletal muscle, beginning with the most superficial?
a: Endomysium
b: Epimysium
c: Perimysium
A. a, b, c
B. b, a, c
C. c, a, b
D. b, c, a
E. c, b, a
D. b, c, a
- The structure responsible for attaching muscle to bone is a
A. sphincter.
B. ligament.
C. fascia.
D. tendon.
E. myofibril.
D. tendon.
- The neurons that stimulate muscle contraction are called _____ neurons.
A. sensory
B. contractile
C. inhibitory
D.somatic motor
E. association
D.somatic motor
- The multiple nuclei in skeletal muscle cells are the result of the
A. fusion of myoblasts.
B. cytokinesis of embryonic satellite cells.
C. spontaneous development of nuclei in embryonic cells.
D. stimulation of fibroblasts by hormones.
E. action of testosterone on mesenchyme cell.
A. fusion of myoblasts.
- Which protein makes up the thick filaments?
A. Myosin
B. Actin
C. Tropomyosin
D. Troponin
E. Myopathy
A. Myosin
- What is the letter associated with the dark bands in a sarcomere?
A. I
B. A
C. Z
D. M
E. H
B. A
11.
In a sarcomere, which letter is associated with the thin dark line in the middle of an I band?
A. A
B. Z
C. M
D. H
B. Z
12.
In a sarcomere, which letter is associated with a region within the A band that is more lightly shaded because only thick filaments are
present?
A. I
B. A
C. M
D. Z
E. H
E. H
13.
In a sarcomere, which letter is associated with the light band that contains thin filaments only?
A. I
B. A
C. M
D. Z
E. H
A. I
14.
A sarcomere is defined as the distance from one _____ to the next.
A. Z disc
B. I band
C. H zone
D. A band
E. M line
A. Z disc
- Which is not a protein found in thin filaments?
A. Actin
B. Troponin
C. Tropomyosin
D.
Myosin
E. No exceptions; all are found in thin filaments.
D.
Myosin
- Which incorrectly describes what happens during skeletal muscle contraction?
A. The width of the A band remains constant.
B. The H zone disappears.
C. The Z discs of a sarcomere move farther apart.
D. The sarcomere narrows.
E. The I bands narrow.
C. The Z discs of a sarcomere move farther apart.
- The narrow space that separates the motor neuron and the skeletal muscle fiber in a neuromuscular
junction is called the
A. motor end plate.
B. synaptic vesicle.
C. synaptic cleft.
D. synaptic knob.
C. synaptic cleft.
- Which structures are reservoirs that store acetylcholine?
A. Synaptic vesicles
B. Synaptic clefts
C. Terminal cisternae
D. Lysosomes
E. Sarcomeres
A. Synaptic vesicles
- Which are the reservoirs that store the calcium required for muscle contraction?
A. Synaptic vesicles
B. Synaptic clefts
C. Terminal cisternae
D. Peroxisomes
E. Mitochondria
C. Terminal cisternae
- The calcium ions involved in skeletal muscle contraction bind to a(n)______ subunit.
A. myosin
B. actin
C. elastin
D. tropomyosin
E. troponin
E. troponin
- Which of the myofilaments of a muscle fiber has the active sites to which the heads of the thick
filaments will bind?
A. Actin
B. Troponin
C. Tropomyosin
D. Myosin
E.
Thick filament
A. Actin