Cell and Muscle Histology Quiz
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What is the sarcolemma?
A. Cytoplasm of muscle cells
B. Smooth ER of the muscle cells
C. Membrane and external lamina of muscle cells
D. Repetitive functional unit of muscles
What do you call #2?
A. A-band
B. I-band
C. M-line
D. Z-disc
E. H-zone
With the transmission electron microscope skeletal muscle fibers can be seen to contain structures called triads. What do the two lateral components of a triad represent?
A. Attachment sites for thick myofilaments
B. Sites for calcium sequestration and release
C. Sites for impulse conduction into the fiber
D. Sites for ATP production
E. Sites for synthesis of proteins to be secreted outside the cell
What specialized junction is an anchoring site for actin?
A. Intercalated disc
B. Fasciae adherents
C. Gap junctions
D. Desmosomes
All of these are thin filaments except for:
A. Myosin
B. Actin
C. Tropomyosin
D. Troponin
Which characteristic is unique to cardiac muscles?
A. Contain centrally located nuclei
B. Striated
C. Often branched
D. Multinucleated
E. Lack T-tubule
Myelinated motor nerves innervate the muscle via
A. Acetylcholine
B. Norepinephrine
C. GABA
D. Epinephrine
Which feature typifies T-tubules?
A. Evaginations of the sarcoplasmic reticulum
B. Sequester calcium during muscle relaxation, releasing it during contraction
C. Carry depolarization to the muscle fiber interior
D. Overlie the A-I junction in cardiac muscle cells
E. Rich supply of acetylcholine receptors
Muscle cells are _______ origin.
A. Mesodermal
B. Endodermal
C. Ectodermal
It is responsible for initiating muscle contraction in skeletal muscles.
A. Sarcoplasmic reticulum
B. Sarcolemma
C. Sarcomere
D. Sarcoplasm
What muscle is also known as visceral muscle?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
What is the functional unit of a muscle?
A. Epithelial cell
B. Mesenchymal cell
C. Myoblast
D. Sarcomere
In smooth muscle, calcium released by the smooth ER initiates contraction by binding to what protein?
A. Actin
B. Calmodulin
C. Desmin
D. Myosin light chain kinase
E. Tropomyosin
What type of muscle is found in the walls of the organs?
A. Smooth muscle
B. Cardiac muscle
C. Smooth and cardiac muscles
D. Skeletal muscles
E. Smooth and skeletal muscles
What proteins are absent in smooth muscles?
A. Tropomyosin and troponin
B. Troponin and myosin
C. Tropomyosin and myosin
D. Troponin and actin
Which characteristic is unique to smooth muscle?
A. T-tubules lie across Z lines
B. Cells have centrally located nuclei
C. Each thick filament is surrounded by six thin filaments
D. Thin filaments attach to dense bodies
E. Cells are multinucleated
The basal lamina of a muscle fiber is part of which structure?
A. Perimysium
B. Epimysium
C. Fascia
D. Endomysium
E. Sarcoplasmic reticulum
Which of the protein pairs are found in thick and thin filaments respectively?
A. Actin-myosin
B. Troponin-tropomyosin
C. Desmin-vimentin
D. Myosin-actin
What do you call #3?
A. A-band
B. I-band
C. M-line
D. Z-disc
E. H-zone
What do you call #1?
A. A-band
B. I-band
C. M-line
D. Z-disc
E. H-zone
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