Muscle Tissues

1. The I band of two neighbour sarcomeres is composed of:

• myosin filaments

• actin filaments

• actin and myosin filaments

• vinculin and troponin filaments

• dynein and tropomyosin filaments

Triad of skeletal muscle tissue fiber contains:

• two half of I band and one A band

• two actin filaments and one myosin filament

• two terminal cisternae of smooth endoplasmic reticulum and one T system

• two nuclei of muscle fiber and one myosatellitocyte

• one smooth endoplasmic reticulum cisterna and two T systems

3. Cardiac muscle cell. Choose the correct answers:

• it is a flattened cell

• contains one or two nuclei, centrally located

• myofibrils are situated at the periphery, under sarcolemma

• intercalated discs contain desmosomes and nexuses

• myofibrils are formed of thin and thick myofilaments.

4. Myosatelitocytes:

• arise from myotom

• are situated between plasmalemma and basal membrane of muscle fibers

• arrive as cambial elements for skeletal muscle tissue

• are capable of contraction

• provide the regeneration of skeletal muscle tissue in postembryonic period

5. Myoepitelial cells can be found in:

• glands of ectodermal origin

• striated muscle fibers

• endocrine glands

• blood vessels

• epithelia

Smooth muscle tissue

• arise from myotomes of somites

• arise from mesemchyme

• contracts involuntary

• is innervated by motor neurons of spinal cord

• contains spindle-shaped cells with centrally located nucle