In a clinical setting, the patient was diagnosed with a leg muscle injury. The tissue regenerates slowly due to:

• fission of muscle fiber nuclei

• fibroblast division and differentiationincrease in the number of myofibrils

• mitotic division of myosatellite cellsfission of muscle fiber nuclei

• increase in the number of myofibrils

Identify the tissue, the main structural unit of which is a fiber, which consists of symplast and satellite cells covered by a common basement membrane:

• smooth muscle

• skeletal muscle

• cardiac muscle

• loose connective

In the phase of contraction of the myocardium (systole) in the sarcoplasm of cardiomyocytes, the concentration of calcium ions increases sharply. Indicate the structures that deposit calcium ions:

• lysosomes

• L system

• ribosomes

• T - system

The sarcomere is schematically shown in the figure. At the maximum reduction of the H-zone of the sarcomere ...

• does not change

• disappears

• doubled

• occupies the entire sarcomere

As a result of myocardial infarction, damage to the area of ​​the heart muscle occurred, which is accompanied by mass death of cardiomyocytes. Replacing the formed defect in the structure of the myocardium will provide ...

• cardiomyocytesmyosatellite cells

• myosatellite cells

• fibroblasts

• epithelial cells

In the study of striated muscle fiber after mechanical injury, the destruction of thick myofilaments is observed. Pathological changes will be localized in ...

• disk I

• half drive A

• drive A and drive I

• drive Adisk I

A patient with damage to the muscles of the lower extremities was delivered to the trauma center. Reparative regeneration of muscle fibers is possible due to ...

• myosatellite cells

• myoepithelial cells

• myofibroblasts

•  fibroblasts

The influence of virus toxins on the cranial part of the neural tube of the embryo led to the formation of a malformation of muscle tissue in the child. What muscles were affected?

• The muscles of the forearm

• The muscles of the wall of the stomach

• Muscle constricting and dilating pupilThe muscles of the forearm

• Myocardium

During surgery, a part of the small intestine was removed from the patient. What elements can be used to regenerate the muscular membrane?

• Smooth myocytes

• Myosymplasts

• Myosatellite cells

• Fibrocytes

In the histological preparation of the pyloric stomach, fibers are presented consisting of spindle-shaped cells containing a rod-shaped nucleus in the center of the cytoplasm. What tissue do these cells form?

•  loose fibrous connective

• skeletal muscle

• Smooth muscle

• Epithelial