Question: 168: Choose the correct statement about a muscular tissue :
(1) Skeletal muscle fibres are uninucleated and found in parallel bundles.
(2) Intercalated discs allow the cardiac muscle cells to contract as a unit.
(3) The walls of blood vessels are made up of columnar epithelium.
(4) Smooth muscles are multinucleated and involuntary.
Answer: Option (2)
Explanation:
Cardiac muscle fibres are branched, striated, and connected to each other by intercalated discs.
Intercalated discs contain gap junctions and desmosomes that allow rapid transmission of electrical impulses between cells.
This enables all cardiac muscle cells to contract together as a functional unit, ensuring coordinated heartbeats.
Skeletal muscle fibres are multinucleated, not uninucleated, though they are arranged in parallel bundles.
The walls of blood vessels are mainly composed of smooth muscle and simple squamous epithelium,
not columnar epithelium.
Smooth muscles are uninucleated and involuntary, not multinucleated.
Therefore, the correct statement is option (2).