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Юриспунденкция

What structures are responsible for the trophism of striated muscle?

a. +nuclei and common organelles

b. myofibrils

c. telophragmas and mesophragmas

d. sarcolemma

e. triads

218. Thin myofilaments of the sarcomere of striated muscle fibre make up:

a. telophragma

b. mesophragma

c. +isotropic disk

d. anisotropic disk

e. T-tubules

219. Thick myofilaments of the sarcomere of striated muscle fibre make up:

a. telophragma

b. masophragma

c. isotropic disk

d. +anisotropic disk

e. T-tubules

220. Sarcomeres represent the basic reoccuring structural units of the myofibril, comprising the myofilaments and associated organelles which lie between:

a. two M-bands

b. +two Z-bands

c. M- and Z-bands

d. overlap zone and M-band

e. overlap zone and Z-band

221. Common border-line structure between adjacent sarcomeres is:

a. mesophragma (M line)

b. +telophragma (Z line)

c. H-zone

d. T-tubules

e. overlap zone

222. Area of the sarcomere of striated muscle, in which one thick filament is surrounded by six thin ones:

a. telophragma

b. mesophragma

c. +overlap zone

d. isotropic disk

e. H-zone

223. In striated muscle fibre, the I-band of the sarcomere of myofibril is made up of:

a. myosin filaments

b. +actin filaments

c. microtubules

d. collagen of the first type

e. collagen of the second type

224. H-zone (light zone) of A-band of the myofibril of striated muscle fibre is made up of:

a. +myosin filaments

b. actin filaments

c. microtubules

d. collagen of the first type

e. collagen of the second type

225. Z-line (telophragma) of the myofibrils of striated muscle fibre is situated:

a. +in the middle of I-band

b. in the middle of overlap zone

c. in the middle of A-band

d. between overlap zone and M-band

e. on each side of M-band

226. Myosin filaments of the striated muscle are connected with Z line by means of molecules of the following protein:

a. actin

b. myosin

c. tropomyosin

d. troponin

e. +titin

227. In case of contraction of the striated muscle fibre, the heads of myosin moleculescome into contact with molecules of the following proteins:

a. tropomyosin and troponin

b. nebulin and myomesin

c. +actin

d. nebulin and titin

e. titin and myomesin

228. M-line (mesophragma) of the myofibrils of striated muscle fibre is situated:

a. in the middle of I-band

b. in the middle of overlap zone

c. +in the middle of A-band

d. between overlap zone and Z-band

e. on each side of Z-band

229. M-line of the sarcomere of striated muscle fibre is made up of:

a. actin

b. actinin

c. tropomyosin

d. +myomyosin

e. myosin

230. T-tubules represent:

a. microtubules

b. elongated mitochondria

c. +invaginations of the sarcolemma into the sarcoplasm

d. canaliculi of the sarcoplasmic reticulum

e. invaginations of the basal membrane into sarcoplasm

231. Triad of the striated muscle fibre represents a complex that consists of:

a. +one T-tubule and two cisterns of the sarcoplasmic reticulum

b. two T-tubules and one cistern of the sarcoplasmic reticulum

c. three T-tubules

d. three cisterns of sarcoplasmic reticulum

e. one T-tubule and two mitochondria

232. Canaliculi of the sarcoplasmic reticulum of the striated muscle fibres contain:

a. +ions of calcium

b. ions of phosphorus

c. molecules of adenosine triphosphoric acid

d. molecules of acid phosphatase

e. molecules of alkaline phosphatase

233. White skeletal muscle is characterized by:

a. +presence of a large number of myofibrils

b. presence of a quantity of myoglobin

c. presence of a small number of myofibrils

d. absence of myofibrils

e. high content of the oxidizing enzymes

234. Red skeletal muscle is characterized by:

a. presence of a large number of myofibrils

b. +presence of a quantity of myoglobin

c. low content of myoglobin

d. absence of myofibrils

e. low content of oxidizing enzymes

235. What tissue is the endomysium of striated muscle made up of:

a. +loose irregular fibrous connective

b. dense irregular connective

c. dense regular connective

d. mucous

e. reticular

236 . What tissue is the perimysium of striated muscle made up of:

a. +loose irregular connective

b. dense irregular connective

c. dense regular connective

d. mucous

e. reticular

237. What tissue is the epimysium of striated muscle made up of:

a. loose irregular connective

b. +dense irregular connective

c. adipose

d. mucous

e. reticular

238. Muscle is attached to tendon by means of:

a. +collagen fibres

b. mature elastic fibres

c. oxytalan fibres

d. reticular fibres

e. elaunin fibres

There is a histologic specimen of the muscular tissue that is stained with hematoxylin-eosin. In the histologic specimen one can see oxyphil muscle fibres that are arranged parallel to one another. The fibres contain numerous nuclei situated under the sarcolemma. What type of muscular tissue is it?

a. mesenchymal

b. epidermal

c. neural

d. coelomic

e. +somatic

There are histologic specimens of muscular tissue that are stained with hematoxylin-eosin. In the histologic specimens one can see muscle cells containing oxyphilic cytoplasm. The nucleus of each cell is located centrally. The junctions between adjoining cells are seen as dark staining transverse lines (intercalated discs). What type of muscular tissue is that?

a. mesenchymal

b. epidermal

c. neural

d. +coelomic

e. somatic

241. Myoepithelial cells arise from:

a. visceral layer of splanchnotom

b. myotomes of the somites

c. mesenchyme

d. endoderm

e. +ectoderm

242. Muscle cells of the iris of eye develop from:

a. visceral layer of splanchnotom

b. myotomes of the somites

c. mesenchyme

d.+neuroglia

e. endoderm

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