Question

[Fill Blank]

Cell junctions in contractile cells are called______, which congain of two parts:____and____.

contain*

Answer 1

Cell junction in contractile cells are called Intercalated Disc .It contains 2 parts Desmosomes and Gap junctions.

Explanation-

*Contractile cells are seen in cardiac muscles .
* Cardiac muscles are also striated muscle cells like skeletal muscles .

*Muscle fibers branch and interdigitate .

*Cell junction is called Intercalated discs where the two parallel branching fibre merge with each other .
* Intercalated discs have gap junctions and Desmosomes which help in forceful and fast contraction of heart muscles .

*Intercalated disk is the place of mechanical electrical coupling of muscle fibers. (Electrical coupling is by means of gap junctions, mechanical coupling by fusion of plasma membrane with help of desmosome) Act as a functional syncytium because of gap junction