Question

Intercalated discs are present in
A. Cardiac muscle
B. Striped muscle
C. Unstriated muscle
D. Ligaments

Answer 1

Hint:-intercalated disc are known as gap junctions, which are required for coordinated
muscle contraction and maintenance of circulation. Intercalated disc play vital role in bonding

Complete step-by-step solution:-
The three types of muscle tissue are Cardiac, Smooth and Skeletal .Each type of muscle
tissue has unique structure and specific role .Cardiac muscle cells are located in the walls of the
heart ,appear striated and are under involuntary control .The ends of each cardiac muscle cell form
intercalated disc where they meet neighbouring cardiac muscle cells. Intercalated discs are unique
structural formations found between myocardial cells of heart. They play vital roles in bonding
cardiac muscle cells together and in transmitting signals between cells. Each intercalated disc
contain finger like extensions .Three types of special structures-fascia, adherens, desmosomes and
gap junctions are found in intercalated discs ,to help in the connection of the cardiac muscle cells.
Cardiac muscle cells produce strong contractions to pump blood throughout the body,but these
The same contractions threaten to destroy the structures of the heart. Intercalated discs play a vital role
in holding cardiac muscle cells together using the fascia adherens and desmosomes. Gap junctions
allow ions to pass from one cardiac muscle cell to another, providing an extremely fast conduction of
action potential through cardiac muscle. Thus helps cardiac muscle to work as a single functional
unit. Intercalated discs are unique structural formations found between the myocardial cells of the
heart and these are the microscopic identifying features of cardiac muscle
So, the right option is A.

Note:- Cardiac muscle fibre cells also are extensively branched and are connected to one other at their ends by intercalated discs. An intercalated disc allows the cardiac muscle cells to contract in the wave like pattern so that the heart can work as a pump.