Medical Quiz

Cell and Muscle Histology Quiz


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Muscle cells are _______ origin.

A. Mesodermal

B. Endodermal

C. Ectodermal


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


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 is the functional unit of a muscle?

A. Epithelial cell

B. Mesenchymal cell

C. Myoblast

D. Sarcomere


What specialized junction is an anchoring site for actin?

A. Intercalated disc

B. Fasciae adherents

C. Gap junctions

D. Desmosomes


What do you call #1?

A. A-band

B. I-band

C. M-line

D. Z-disc

E. H-zone


What do you call #3?

A. A-band

B. I-band

C. M-line

D. Z-disc

E. H-zone


Myelinated motor nerves innervate the muscle via

A. Acetylcholine

B. Norepinephrine

C. GABA

D. Epinephrine


The basal lamina of a muscle fiber is part of which structure?

A. Perimysium

B. Epimysium

C. Fascia

D. Endomysium

E. Sarcoplasmic reticulum


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


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


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


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


All of these are thin filaments except for:

A. Myosin

B. Actin

C. Tropomyosin

D. Troponin


What proteins are absent in smooth muscles?

A. Tropomyosin and troponin

B. Troponin and myosin

C. Tropomyosin and myosin

D. Troponin and actin


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


Which characteristic is unique to cardiac muscles?

A. Contain centrally located nuclei

B. Striated

C. Often branched

D. Multinucleated

E. Lack T-tubule


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 do you call #2?

A. A-band

B. I-band

C. M-line

D. Z-disc

E. H-zone




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