Question

The intercalated discs of__ muscle__
A. Smooth; provide strong mechanical adhesion and rapid electrical communication
B. Skeletal; is the for all voluntary muscle actions
C. Skeletal; make possible both fast twitches and slow twitches
D. Cardiac; provide strong mechanical adhesion and rapid electrical communication.

Answer 1

Hint:
Muscles are made up of elastic tissue. Thousands of muscle fibers constitute elastic tissues. These muscles work together with the nerve fibers to do all voluntary and involuntary functions of the body. The intercalated disc is formed by the end of the cardiac muscles. As a result, the intercalated disc link with the neighbouring cardiac muscle cells.

Complete step by step solution:
The muscles that constitute the heart are known as cardiac muscles. Cardiac muscles are also known as myocardium. The cardiac muscles contract and relax tirelessly from birth to death. The muscles like smooth muscles work without our consciousness ie they are involuntary muscles. The cells of the cardiac muscles are tubular in structure and constitute myofibrils. The cardiac muscle cells also contain mitochondria and cells appear striated or striped under the microscope.
Intercalated discs are the segments of cardiac muscles. The plasma membrane of the intercalary disc forms finger-like projections that interlock with identical structures with the adjacent cells. Fascia adherens, desmosomes, and gap junctions are present in intercalated discs. These special structures assist in connection with the cardiac muscle cells. It also provides fast electrical communication and strong mechanical adhesion.
Hence the correct answer is Cardiac; provides strong mechanical adhesion and rapid electrical communication.

Option ‘D’ is correct

Note:
Intercalated discs play a crucial role in holding the cardiac muscle cells together. This is done by the facia adherens and desmosomes. While gap junctions allow the transport of ions from one cardiac muscle cell to another.