What feature does cardiac muscle possess that is missing in skeletal muscle?
ক
ক) Striations
খ
খ) Multiple nuclei
গ
গ) Voluntary control
ঘ
ঘ) Intercalated discs
ব্যাখ্যা
Intercalated discs join the membrane of one cardiac cell with its neighbour and promote rapid conduction of depolarisation between cells.
৬.
Which is not true regarding skeletal muscle fibres?
ক
cells are multinucleated
খ
have prominent cross striation
গ
have gap junctions between the cells
ঘ
have well developed sarcoplasmic reticulum
ব্যাখ্যা
[Ref. Junqueira 15th]
৭.
Which muscle has dual nerve supply?
ক
Adductor longus
খ
Biceps brachii
গ
Flexor digitorum superficialis
ঘ
Pectoralis major
৮.
Regarding skeletal muscle-
ক
ক) Long, cylindrical and branched
খ
খ) Gap junction present
গ
গ) Nucleus is single, oval and central
ঘ
ঘ) Striations present
ব্যাখ্যা
-Long, cylindrical and not branched -Gap junction absent -Sarcomeres present -Skeletal muscle is multi-nucleated and nucleus is situated peripherally.
৯.
Cardiac muscle fibres-
ক
are multinucleated
খ
have prominent cross striation
গ
are fusiform in shape
ঘ
have T-tubules
১০.
Muscle fascicle is covered by
ক
ক) Endomysium
খ
খ) Epimysium
গ
গ) Perimysium
ঘ
ঘ) Panmyseium
১১.
Criteria of smooth muscle fiber excludes
ক
ক) Fusiform
খ
খ) Linked by numerous tight junction
গ
গ) No striation
ঘ
ঘ) No branching
ব্যাখ্যা
Smooth muscle fibers are individual small, fusiform (tapering) cells, linked by numerous gap junctions.Thin and thick filaments in smooth muscle fibers do not form sarcomeres, and no striations are present. Branching is absent.
১২.
Intercalated disc is present in which type of muscle fiber?
ক
ক) Skeletal
খ
খ) Smooth
গ
গ) Cardiac
ঘ
ঘ) All of them
১৩.
Aortic opening of diaphragm at the level of-
ক
ক) T6
খ
খ) T8
গ
গ) T10
ঘ
ঘ) T12
ব্যাখ্যা
Aortic opening of diaphragm at the level of T12
১৪.
Regarding red muscle fibers
ক
ক) Present in small amount
খ
খ) Less mitochondria present
গ
গ) Blood supply rich
ঘ
ঘ) Myofibrils more
ব্যাখ্যা
Except rich blood supply all are the criteria of white fibers
১৫.
Structural and functional subunit of muscle fibre is-
ক
Actin
খ
Myofibril
গ
Myosin
ঘ
Myofilament
ব্যাখ্যা
Myofibrils are the structural and functional subunits of muscle fiber. Myofibrils are arranged longitudinally in the muscle fiber and runs in the entire length of muscle fiber.
Sarcomere is the structural & functional unit of myofibrils.
১৬.
The substance of the tongue is made up chiefly of
ক
ক) Connective tissue
খ
খ) Skeletal muscle
গ
গ) Smooth muscle
ঘ
ঘ) Epithelial tissue
ব্যাখ্যা
The substance of the tongue is made up chiefly of skeletal muscle supported by connective tissue. The muscle is arranged in bundles that run in vertical, transverse and longitudinal directions. This arrangement of muscle permits intricate movements of the tongue associated with the chewing and swallowing of food, and those necessary for speech.
১৭.
Striated muscle is present in-
ক
Central tendon of the diaphragm
খ
Lower part of the rectum
গ
Nipple
ঘ
Upper third of the esophagus
ব্যাখ্যা
Visceral striated muscles: These are microscopically identical to the skeletal muscles, but they are confined to the viscera such as tongue, pharynx, peripheral part of the diaphragm, and upper two third of esophagus.