Skeletal Muscle Components and Fibers

HISTOLOGY DR. AHMED ZAHRA MCQ 1.The connective tissue component of the skeletal muscle consists of a) Epimysium b) Perimysium c) Endomysium d) All of the above answer d 2.The types of skeletal muscle fibres are a) Red, white and intermediate b) Smooth, striated and cardiac c) Voluntary and involuntary d) Bone and non-bone attached answer a 3.Followings concerning the skeletal muscle fibers are true EXCEPT a) They are multinucleated cells b) Ectodermal in origin c) They have acidophilic sarcoplasm d) In longitudinal sections it shows cross-striations answer b 4.The sarcoplasm contains the followings EXCEPT a) Well developed Golgi and prominent RER b) Myofibrils c) Well-developed sarcoplasmic reticulum d) Glycogen and lipid droplets answer a 5.Sarcoplasmic reticulum is a special term for a) Rough endoplasmic reticulum in the muscle b) Mitochondria in the muscle c) Smooth endoplasmic reticulum in the muscle d) Cytoplasm of the muscle answer c 6.Terminal cisternae are a) The dilated spaces in the mitochondria of the muscle b) The terminal dilatation of the sarcoplasmic reticulum c) Invagination of the sarcoplasmic membrane d) None of the above answer b 13 HISTOLOGY DR. AHMED ZAHRA MCQ 7.The following cell inclusions are seen in the skeletal muscle EXCEPT a) Lipids b) Glycogen c) Myoglobin d) Hemoglobin answer d 8.Triad is a) One T-tubule and two terminal cisternae b) Two T-tubules and one terminal cisternum c) Repeated at every Z line d) Composed of actin, myosin and tropomyosin answer a 9.Myofilaments are a) Thick filaments b) Thin and thick filaments c) Thin and intermediate filaments d) Thick and intermediate filaments answer b 10.One of the followings consists of actin filaments only a) A band b) I band c) H zone d) Sarcomere answer b 11. One of the followings consists of thick filaments only a) A band b) I band c) H zone d) Sarcomere answer c 12. One of the followings consists of thin and thick filaments a) M line b) I band c) H zone d) A band answer d 13.During contraction, the following does NOT change its lengths a) Sarcomere b) A band c) I band d) H zone answer b 14 HISTOLOGY DR. AHMED ZAHRA MCQ 14.Calcium ions during muscle contraction is regulated by a) Terminal cisternae b) Sarcoplasmic reticulum c) Mitochondria d) T tubules answer b 15.In longitudinal sections, the following bands are recognized EXCEPT a) Dark band (anisotrope) b) I band (isotrope) c) H band d) Chromosome band answer d 16.T-tubule is a) Full of sarcoplasm b) A direct regulator for Ca ions in the muscle cell c) An invagination of the sarcolemma inside the cytoplasm d) Continuous with sarcoplasmic cisternae answer c 17.The statements concerning the red muscle fibers are true EXCEPT a) Small in diameter b) Rich in myoglobin c) Less numerous mitochondria d) Resist the fatigue answer c 18. The statements concerning the white muscle fibers are true EXCEPT a) Large in diameter b) Rich in myoglobin c) Less numerous mitochondria d) Fast contraction answer b 19.The followings concerning cardiac muscle cells are true EXCEPT a) The nucleus is single large and central b) The muscle fibers branch and anastomose c) Show non-clear striations d) Can regenerate answer d 20.In the smooth muscle cells, caveolae means a) Dense plaques b) Gap junctions c) Vesicular invaginations of the cell membrane d) None of the above answer c 15 HISTOLOGY DR. AHMED ZAHRA MCQ 21.Following statements concerning smooth muscle are true EXCEPT a) The cells are fusiform in shape b) Non Striated cells c) Can regenerate d) Multinucleated cells answer d 22. Following statements concerning smooth muscle are true EXCEPT a. The cells are fusiform in shape b. Non Striated cells c. Can regenerate d. Multinucleated cells answer d 23. the wall of the heart is formed of a. b. c. d. epicardium myocardium endocardium all of the above answer d 24.In skeletal muscle cells, all true except: a. b. c. d. Mesodermal in origin. Surrounded by satellite cells. cylindrical non branched cells T tubules pass at Z lines of myofibrils. answer d 25.Which of the following cells has the ability to divide: a. b. c. d. Skeletal muscle fiber. Smooth muscle fiber. Cardiac muscle fibers. none of the above. answer b 26. Arrangement of T tubules & sarcoplasmic reticulum in skeletal muscle: a. b. c. d. Triad. Dyad. Hexagonal. Octameric. answer a 16 HISTOLOGY DR. AHMED ZAHRA MCQ 27. About satellite cells of skeletal muscle, all are true except: a. b. c. d. They are active myoblast. Persist between sarcolemma & basal lamina. Originate from myoblasts. Responsible for skeletal muscle's ability to regenerate answer a 28. Cardiac muscles are connected at: a. b. c. d. Tendon Intercalated discs Perimysium endomysium answer b 29. Smooth muscle, all true except: a. b. c. d. Have subsurface vesicles called Caveolae. Rich in T tubules. Connected by gap junctions. Cytoplasm show acidophilic granules called dense bodies. answer b 30. C.T. surrounding skeletal muscle bundles together (whole muscle): a. b. c. d. Perimysium. Epimysium. Endomysium. Entramysium. answer b 31.Which of the following conduct the wave of depolarization to sarcoplasmic reticulum a. Basal lamina b. Myofibrils c. T-tubules d. Sarcolemma answer C 17 HISTOLOGY DR. AHMED ZAHRA MCQ 32.Triad is formed of: a. 3 T tubules b. 2Tubules & 1 sarcoplasmic reticulum c. 1 Tubules & 2 sarcoplasmic reticulum d. 3 sarcoplasmic reticulum answer C 33.Concerning cardiac muscle, which is true: a. b. c. d. Have triad tubular system Spindle shaped Multinucleated Joined together by intercalated discs Answer D 34.Muscle that can regenerate by mitosis: a. Heart muscles b. Muscles of blood vessels c. Skeletal muscles d. Muscles of tongue answer B 35.T triads, all true except: a. They could be observed by the electron microscope b. Formed of T tubule & 2 terminal cisternae c. Located at Z lines d. T tubules transmit the depolarization wave to the inside of the muscle cell answer C 36.Damage of cardiac muscle is healed by: a. Division of cardiac muscle fibers b. Satellite cells c. Adipose tissue d. Fibrous tissue answer D 18 HISTOLOGY DR. AHMED ZAHRA MCQ 37.Smooth muscle: a. Never divide b. Lack intermediate filaments c. Are striated d. Contain sarcolemmal vesicles & caveolae e. Contain well developed sarcoplasmic reticulum answer D 38.Regarding sarcomere: a. The A band is bisected by z line b. The I band is bisected by H band c. The H zone contains myosin only d. The I band contains actin & myosin answer C 39.Cardiac muscle fibers: a. Non branched fibers b. T tubules are at the Z lines c. Are multinucleated fibers d. Are dividable (can divide) answer B 40.Sarcomere is formed of: a. One dark band & one light band b. One dark band & 2 halves of light band c. One dark band & 2 light bands d. 2 dark bands answer B 41.Cardiac muscle fibers: a. Voluntary muscles b. Have No satellite cells c. Have no transverse tubules d. Are fusiform spindle shaped answer B 19 HISTOLOGY DR. AHMED ZAHRA MCQ 42.concerning muscle fibers, the following is true a. muscle cells are termed muscle band b. muscle fibers are mesodermal in origin c. special organelles are the myoglobin d. cell membrane is termed sarcomere answer b 43. As regards muscle fibers, one is true : a. Originate from endoderm b. Main organelle responsible for contraction is mitochondria c. Originate from ectoderm d. inclusions include fat, glycogen & myoglobin answer d 44.the connective tissue of skeletal muscle fibers is differentiated into a. epimysium which covers the muscle bundles b. endomysium which surrounds muscle fibers c. perimysium which surrounds muscle fascicles (bundles) d. both b & c are correct answer d 45.nuclei of skeletal muscle fibers are characterized by being a. multiple, rounded, peripheral b. multiple, oval, peripheral c. single, oval, eccentric d. single, oval central answer b 46.Sarcoplasm of skeletal muscle fibers shows the following by LM a. Rich in rER b. Transverse striations c. Few mitochondria between myofibrils d. In longitudinal section, myofibrils appear as dots answer b 47. As regards sarcoplasmic reticulum, one statement is correct a. Well developed in skeletal muscle fibers b. Forms a network around mitochondria c. Participate in the formation of diad tubular system in skeletal muscle fibers d. Participate in the formation of triad tubular system in cardiac muscle fibers answer a 48.Triad tubular system is characterized by a. Invagination of sarcoplasm b. Invagination of sarcolemma is at level of Z line c. Invagination of sarcolemma at A-I junction d. The cavity of T tubules is separated from the surface answer c 20 HISTOLOGY DR. AHMED ZAHRA MCQ 49.sarcoplasmic reticulum surround which of the following a. skeletal muscle actin filaments only b. skeletal muscle myosin filaments only c. skeletal muscle fibers d. skeletal muscle myofibrils answer d 50.In the smooth muscle cells, caveolae means a. Dense plaques b. Gap junctions c. No triad or diad d. None of the above answer c 51.the shape of skeletal muscle fibers is a) cylindrical branched except in face & tongue b) fusiform branched except in face & tongue c) fusiform non branched except in face & tongue d) cylindrical non branched except in face & tongue answer d 52.the cell membrane of a muscle fiber is called a) epimysium b) sarcoplasm c) endomysium d) sarcolemma answer d 53. muscle cell also can be termed: a) myosin b) muscle fiber c) muscle fibril d) muscle filament answer b 54. Microscopic features of skeletal muscle fibers show: a) the sarcolemma covered by perimysium b) multiple oval central nuclei c) acidophilic cytoplasm with clear striations d) transverse myofibrils running in the cytoplasm answer c 55. organelles in the sarcoplasm of skeletal muscle fibers: a) many lysosomes b) numerous mitochondria in rows between myofibrils c) few longitudinal myofibrils d) prominent rER answer b 21 HISTOLOGY DR. AHMED ZAHRA MCQ 56.One character is belonging to red skeletal muscle fibers: a. b. c. d. Depend on their anaerobic pathway for energy production. Contraction is fast. Contain abundant mitochondria. Their deep color is due to few myoglobin. answer c 57.White skeletal muscle fibers were described to have: a. b. c. d. Deep color. Less numerous mitochondria Abundant myoglobin. Less abundant glycogen. answer b 58.Skeletal muscle fibers are capable of regeneration: a. b. c. d. Through proliferation of stem cells. Despite injury of C.T. endomysium. By satellite cells. With wide capacity of regeneration. answer c 59.Light microscopic picture of cardiac muscle fibers shows: a. b. c. d. Branching non-anastomosing fibers. Large in size. Arranged in different directions. Fusiform in shape. answer c 60. Concerning ultrastructural features of cardiac muscles, which of the following is true: a. b. c. d. More numerous myofibrils than in skeletal muscles. Few mitochondria. Diad tubular system. Lysosomes are abundant. answer c 22 HISTOLOGY DR. AHMED ZAHRA MCQ 61.Intercalated disc is characterized by; a. b. c. d. Being transverse line crossing skeletal muscle fibers. Being formed at level of A-I band junction. Gap junction existing at the transverse segment. Adherens junction prevent separation during contraction. answer d 62.As regards regeneration of cardiac muscle fibers one is true: a. b. c. d. Healing develops from sarcomere. Satellite cells play an important role. No regeneration, heal by fibrosis. Cardiac muscles divide repeatedly. answer c 63.Characteristics of Purkinje muscle fibers show: a. b. c. d. Intercalated discs between the muscle cells. Central nuclei one or two. Excess myofibrils peripherally situated. Pale vacuolated sarcoplasm. answer d 64.Smooth muscle fibers are characterized by being a. b. c. d. Non-striated, involuntary, ectodermal in origin Striated, involuntary, mesodermal in origin Non-striated, involuntary, mesodermal in origin. Striated, voluntary, mesodermal in origin answer c 65.Longitudinal sections of smooth muscle fibers appear as follows: a. b. c. d. Polygonal in shape. Cells with wide central area Having eccentric nuclei no apparent nuclei answer b 23 HISTOLOGY DR. AHMED ZAHRA MCQ 66.E.M picture of sarcolemma of smooth muscle fibers shows: a. b. c. d. Thick appearance. Desmosomes between fibers to facilitate spread of excitation. Dense bodies on outer aspect Basal lamina surrounding it answer d 67. Intercalated disk consists of the following except: a. b. c. d. Fascia occludens. Fascia adherens. Macula adherens Gap junction answer a 68. transverse region of Intercalated consists of the following: a. Fascia occludens & fascia adherens. b. Fascia adherens & Macula adherens. c. Macula adherens & zonula adherens d. Gap junction answer b 69. Lateral segment of Intercalated consists of the following: a. b. c. d. Fascia occludens & fascia adherens. Fascia adherens & Macula adherens. Macula adherens & zonula adherens Gap junction answer d 24