Muscle Tissue Flashcards
Mark the correct answers about skeletal muscle:
a) muscle fibres are cylindrical multinucleated cells
b) the nuclei are located centrally
c) the muscle fibres are bound together with intercalated discs
d) abundant mitochondria are found between the myofibrils
A,d
Structure of the three muscle types:
a) skeletal muscle is composed of multinucleated fibres
b) smooth muscle cells are bound together by intercalated disks
c) cardiac muscle has cross-striations
d) smooth muscle consists of a collection of very long, cylindrical cells
A,c
Skeletal muscle:
a) cells have the capacity to divide by mitosis
b) consists of multinucleated cells
c) exercise enlarges the musculature by hypertrophy
d) exercise enlarges the musculature by hyperplasia
B,c
Endomysium:
a) surrounds each muscle fibres
b) is composed of basal lamina and reticular fibres
c) is a layer of connective tissue
d) participates in mechanical transmission of the forces generated by contraction
A,b,c,d
Sarcomere of the skeletal muscle fibres:
a) is the smallest irregular subunit of the contractile apparatus
b) extends from Z-line to Z-line
c) includes the H-band
d) sarcomere is longer during contraction than during relaxation
B,c
Filaments of the skeletal muscle:
a) the thick filaments occupy the A band
b) the thin filaments are attached to the Z line
c) the thick filaments are composed of myosin, tropomyosin and troponin
d) the thin filament are composed of actin
A,b,d
Sarcolemma:
a) sarcomere is surrounded by sarcolemma
b) is composed of basal lamina and reticular fibres
c) is the cell membrane
d) composes finger-like invaginations – the T tubules
C,d
Sarcoplasmic reticulum:
a) is a network of reticular fibres surrounding sarcolemma
b) is the rough endoplasmic reticulum
c) form with T tubules complex known as the triad
d) specifically regulates calcium flow
C,d
Cardiac muscle cells:
a) are fused into syncytial cells
b) possesses one or two nuclei
c) nuclei are located centrally
d) form junctions between their processes
B,c,d
Cardiac muscle cells:
a) do not have the cross-striations
b) modified cardiac myocytes form Purkinje fibres
c) cells are bifurcated or branched
d) cells have capacity to divide by mitosis
B,c
Intercalated discs:
a) two regions can be distinguished by junctions – transverse and lateral portions
b) include maculae adherentes
c) include gap junctions
d) include zonula occludens
A,b,c
Cardiac muscle cells:
a) T tubules and sarcoplasmic reticulum forms triads
b) contain numerous mitochondria
c) granules of lipofuscin can be found in the kardiomyocytes
d) can contain granules with hormonal activity
B,c,d
Skeletal muscle cells can be found in:
a) musculus orbicularis oris
b) lower third of esophagus
c) urinary bladder
d) vocal muscles
A,d
Smooth muscle cells can be found in:
a) arrector pili muscle
b) membranous part of the trachea
c) tunica media of the vessel wall
d) tensor tympani muscle
A,b,c
The smooth muscle cell:
a) is an elongated, non-striated cell
b) is enclosed by a basal lamina and reticular fibres network
c) their size can be up to 500ľm
d) has one or two nuclei
A,b,c
